Add interface for tcp offload to syncache:
- make neccessary changes to release offload resources when a syncache entry is removed before connection establishment - disable checks for offloaded connection where insufficient information is available Reviewed by: silby
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kmacy
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59ef90c02d
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@ -78,6 +78,7 @@ __FBSDID("$FreeBSD$");
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcp_syncache.h>
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#include <netinet/tcp_ofld.h>
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#ifdef INET6
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#include <netinet6/tcp6_var.h>
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#endif
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@ -136,7 +137,8 @@ struct syncache {
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#define SCF_SIGNATURE 0x20 /* send MD5 digests */
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#define SCF_SACK 0x80 /* send SACK option */
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#ifndef DISABLE_TCP_OFFLOAD
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void *sc_pspare[2]; /* toepcb / toe_usrreqs */
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struct toe_usrreqs *sc_tu; /* TOE operations */
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void *sc_toepcb; /* TOE protocol block */
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#endif
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#ifdef MAC
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struct label *sc_label; /* MAC label reference */
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@ -356,6 +358,10 @@ syncache_drop(struct syncache *sc, struct syncache_head *sch)
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TAILQ_REMOVE(&sch->sch_bucket, sc, sc_hash);
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sch->sch_length--;
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#ifndef DISABLE_TCP_OFFLOAD
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if (sc->sc_tu)
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sc->sc_tu->tu_syncache_event(SC_DROP, sc->sc_toepcb);
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#endif
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syncache_free(sc);
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tcp_syncache.cache_count--;
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}
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@ -406,7 +412,6 @@ syncache_timer(void *xsch)
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sch->sch_nextc = sc->sc_rxttime;
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continue;
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}
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if (sc->sc_rxmits > tcp_syncache.rexmt_limit) {
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if ((s = tcp_log_addrs(&sc->sc_inc, NULL, NULL, NULL))) {
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log(LOG_DEBUG, "%s; %s: Retransmits exhausted, "
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@ -873,7 +878,7 @@ syncache_expand(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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* Segment validation:
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* ACK must match our initial sequence number + 1 (the SYN|ACK).
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*/
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if (th->th_ack != sc->sc_iss + 1) {
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if (th->th_ack != sc->sc_iss + 1 && sc->sc_toepcb == NULL) {
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if ((s = tcp_log_addrs(inc, th, NULL, NULL)))
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log(LOG_DEBUG, "%s; %s: ACK %u != ISS+1 %u, segment "
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"rejected\n", s, __func__, th->th_ack, sc->sc_iss);
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@ -884,7 +889,7 @@ syncache_expand(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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* number + 1 (the SYN) because we didn't ACK any data that
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* may have come with the SYN.
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*/
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if (th->th_seq != sc->sc_irs + 1) {
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if (th->th_seq != sc->sc_irs + 1 && sc->sc_toepcb == NULL) {
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if ((s = tcp_log_addrs(inc, th, NULL, NULL)))
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log(LOG_DEBUG, "%s; %s: SEQ %u != IRS+1 %u, segment "
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"rejected\n", s, __func__, th->th_seq, sc->sc_irs);
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@ -901,7 +906,8 @@ syncache_expand(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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* If timestamps were negotiated the reflected timestamp
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* must be equal to what we actually sent in the SYN|ACK.
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*/
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if ((to->to_flags & TOF_TS) && to->to_tsecr != sc->sc_ts) {
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if ((to->to_flags & TOF_TS) && to->to_tsecr != sc->sc_ts &&
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sc->sc_toepcb == NULL) {
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if ((s = tcp_log_addrs(inc, th, NULL, NULL)))
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log(LOG_DEBUG, "%s; %s: TSECR %u != TS %u, "
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"segment rejected\n",
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@ -941,9 +947,10 @@ syncache_expand(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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* consume all available buffer space if it were ACKed. By not ACKing
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* the data, we avoid this DoS scenario.
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*/
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void
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syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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struct inpcb *inp, struct socket **lsop, struct mbuf *m)
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static void
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_syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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struct inpcb *inp, struct socket **lsop, struct mbuf *m,
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struct toe_usrreqs *tu, void *toepcb)
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{
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struct tcpcb *tp;
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struct socket *so;
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@ -1021,6 +1028,11 @@ syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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sc = syncache_lookup(inc, &sch); /* returns locked entry */
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SCH_LOCK_ASSERT(sch);
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if (sc != NULL) {
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#ifndef DISABLE_TCP_OFFLOAD
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if (sc->sc_tu)
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sc->sc_tu->tu_syncache_event(SC_ENTRY_PRESENT,
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sc->sc_toepcb);
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#endif
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tcpstat.tcps_sc_dupsyn++;
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if (ipopts) {
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/*
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@ -1055,7 +1067,7 @@ syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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s, __func__);
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free(s, M_TCPLOG);
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}
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if (syncache_respond(sc) == 0) {
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if ((sc->sc_toepcb == NULL) && syncache_respond(sc) == 0) {
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sc->sc_rxmits = 0;
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syncache_timeout(sc, sch, 1);
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tcpstat.tcps_sndacks++;
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@ -1088,7 +1100,7 @@ syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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}
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}
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}
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/*
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* Fill in the syncache values.
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*/
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@ -1104,7 +1116,10 @@ syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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sc->sc_ip_tos = ip_tos;
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sc->sc_ip_ttl = ip_ttl;
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}
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#ifndef DISABLE_TCP_OFFLOAD
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sc->sc_tu = tu;
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sc->sc_toepcb = toepcb;
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#endif
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sc->sc_irs = th->th_seq;
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sc->sc_iss = arc4random();
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sc->sc_flags = 0;
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@ -1196,7 +1211,7 @@ syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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/*
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* Do a standard 3-way handshake.
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*/
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if (syncache_respond(sc) == 0) {
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if (sc->sc_toepcb || syncache_respond(sc) == 0) {
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if (tcp_syncookies && tcp_syncookiesonly && sc != &scs)
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syncache_free(sc);
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else if (sc != &scs)
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@ -1214,8 +1229,11 @@ syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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if (sc == &scs)
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mac_syncache_destroy(&maclabel);
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#endif
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*lsop = NULL;
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m_freem(m);
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if (m) {
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*lsop = NULL;
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m_freem(m);
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}
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return;
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}
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@ -1374,6 +1392,21 @@ syncache_respond(struct syncache *sc)
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return (error);
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}
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void
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syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
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struct inpcb *inp, struct socket **lsop, struct mbuf *m)
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{
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_syncache_add(inc, to, th, inp, lsop, m, NULL, NULL);
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}
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void
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syncache_offload_add(struct in_conninfo *inc, struct tcpopt *to,
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struct tcphdr *th, struct inpcb *inp, struct socket **lsop,
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struct toe_usrreqs *tu, void *toepcb)
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{
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_syncache_add(inc, to, th, inp, lsop, NULL, tu, toepcb);
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}
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/*
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* The purpose of SYN cookies is to avoid keeping track of all SYN's we
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* receive and to be able to handle SYN floods from bogus source addresses
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@ -1699,4 +1732,3 @@ syncache_pcblist(struct sysctl_req *req, int max_pcbs, int *pcbs_exported)
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*pcbs_exported = count;
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return error;
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}
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@ -40,6 +40,9 @@ int syncache_expand(struct in_conninfo *, struct tcpopt *,
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struct tcphdr *, struct socket **, struct mbuf *);
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void syncache_add(struct in_conninfo *, struct tcpopt *,
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struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *);
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void syncache_offload_add(struct in_conninfo *, struct tcpopt *,
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struct tcphdr *, struct inpcb *, struct socket **,
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struct toe_usrreqs *tu, void *toepcb);
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void syncache_chkrst(struct in_conninfo *, struct tcphdr *);
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void syncache_badack(struct in_conninfo *);
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int syncache_pcbcount(void);
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