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Revert "netfilter: conntrack: add sctp DATA_SENT state" 

This reverts commit (bff3d0534804: "netfilter: conntrack: add sctp
DATA_SENT state")

Using DATA/SACK to detect a new connection on secondary/alternate paths
works only on new connections, while a HEARTBEAT is required on
connection re-use. It is probably consistent to wait for HEARTBEAT to
create a secondary connection in conntrack.

Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@est.tech>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Sriram Yagnaraman 2023-01-24 02:47:20 +01:00 committed by Pablo Neira Ayuso
parent 98ee007745
commit 13bd9b31a9
4 changed files with 42 additions and 70 deletions
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1
include/uapi/linux/netfilter/nf_conntrack_sctp.h
View File

@ -16,7 +16,6 @@ enum sctp_conntrack {
SCTP_CONNTRACK_SHUTDOWN_ACK_SENT, SCTP_CONNTRACK_SHUTDOWN_ACK_SENT,
SCTP_CONNTRACK_HEARTBEAT_SENT, SCTP_CONNTRACK_HEARTBEAT_SENT,
SCTP_CONNTRACK_HEARTBEAT_ACKED, SCTP_CONNTRACK_HEARTBEAT_ACKED,
SCTP_CONNTRACK_DATA_SENT,
SCTP_CONNTRACK_MAX SCTP_CONNTRACK_MAX
}; };

1
include/uapi/linux/netfilter/nfnetlink_cttimeout.h
View File

@ -95,7 +95,6 @@ enum ctattr_timeout_sctp {
CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT, CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT,
CTA_TIMEOUT_SCTP_HEARTBEAT_SENT, CTA_TIMEOUT_SCTP_HEARTBEAT_SENT,
CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED, CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED,
CTA_TIMEOUT_SCTP_DATA_SENT,
__CTA_TIMEOUT_SCTP_MAX __CTA_TIMEOUT_SCTP_MAX
}; };
#define CTA_TIMEOUT_SCTP_MAX (__CTA_TIMEOUT_SCTP_MAX - 1) #define CTA_TIMEOUT_SCTP_MAX (__CTA_TIMEOUT_SCTP_MAX - 1)

102
net/netfilter/nf_conntrack_proto_sctp.c
View File

@ -60,7 +60,6 @@ static const unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] = {
[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS, [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS,
[SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS, [SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS,
[SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS, [SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS,
[SCTP_CONNTRACK_DATA_SENT] = 30 SECS,
}; };
#define SCTP_FLAG_HEARTBEAT_VTAG_FAILED 1 #define SCTP_FLAG_HEARTBEAT_VTAG_FAILED 1
@ -75,7 +74,6 @@ static const unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] = {
#define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT #define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
#define sHS SCTP_CONNTRACK_HEARTBEAT_SENT #define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
#define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED #define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED
#define sDS SCTP_CONNTRACK_DATA_SENT
#define sIV SCTP_CONNTRACK_MAX #define sIV SCTP_CONNTRACK_MAX
/* /*
@ -98,10 +96,9 @@ SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
the SHUTDOWN chunk. Connection is closed. the SHUTDOWN chunk. Connection is closed.
HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow. HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK/DATA/SACK in the direction HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to
opposite to that of the HEARTBEAT/DATA chunk. Secondary connection that of the HEARTBEAT chunk. Secondary connection is
is established. established.
DATA_SENT - We have seen a DATA/SACK in a new flow.
*/ */
/* TODO /* TODO
@ -115,38 +112,36 @@ cookie echoed to closed.
*/ */
/* SCTP conntrack state transitions */ /* SCTP conntrack state transitions */
static const u8 sctp_conntracks[2][12][SCTP_CONNTRACK_MAX] = { static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = {
{ {
/* ORIGINAL */ /* ORIGINAL */
/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA, sDS */ /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
/* init */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA, sCW}, /* init */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA},
/* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA, sCL}, /* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},
/* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, /* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
/* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS, sCL}, /* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS},
/* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA, sSA}, /* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA},
/* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA, sCL},/* Can't have Stale cookie*/ /* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't have Stale cookie*/
/* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA, sCL},/* 5.2.4 - Big TODO */ /* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* 5.2.4 - Big TODO */
/* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA, sCL},/* Can't come in orig dir */ /* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't come in orig dir */
/* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA, sCL}, /* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA},
/* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA, sDS}, /* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
/* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA, sDS}, /* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}
/* data/sack */ {sDS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA, sDS}
}, },
{ {
/* REPLY */ /* REPLY */
/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA, sDS */ /* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
/* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA, sIV},/* INIT in sCL Big TODO */ /* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* INIT in sCL Big TODO */
/* init_ack */ {sIV, sCW, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA, sIV}, /* init_ack */ {sIV, sCW, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},
/* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL, sIV}, /* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL},
/* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR, sIV}, /* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR},
/* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA, sIV}, /* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA},
/* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA, sIV}, /* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA},
/* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA, sIV},/* Can't come in reply dir */ /* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* Can't come in reply dir */
/* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA, sIV}, /* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA},
/* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA, sIV}, /* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA},
/* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA, sHA}, /* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
/* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA, sHA}, /* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA}
/* data/sack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA, sHA},
} }
}; };
@ -258,11 +253,6 @@ static int sctp_new_state(enum ip_conntrack_dir dir,
pr_debug("SCTP_CID_HEARTBEAT_ACK"); pr_debug("SCTP_CID_HEARTBEAT_ACK");
i = 10; i = 10;
break; break;
case SCTP_CID_DATA:
case SCTP_CID_SACK:
pr_debug("SCTP_CID_DATA/SACK");
i = 11;
break;
default: default:
/* Other chunks like DATA or SACK do not change the state */ /* Other chunks like DATA or SACK do not change the state */
pr_debug("Unknown chunk type, Will stay in %s\n", pr_debug("Unknown chunk type, Will stay in %s\n",
@ -316,9 +306,7 @@ sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
ih->init_tag); ih->init_tag);
ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = ih->init_tag; ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = ih->init_tag;
} else if (sch->type == SCTP_CID_HEARTBEAT || } else if (sch->type == SCTP_CID_HEARTBEAT) {
sch->type == SCTP_CID_DATA ||
sch->type == SCTP_CID_SACK) {
pr_debug("Setting vtag %x for secondary conntrack\n", pr_debug("Setting vtag %x for secondary conntrack\n",
sh->vtag); sh->vtag);
ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag; ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag;
@ -404,19 +392,19 @@ int nf_conntrack_sctp_packet(struct nf_conn *ct,
if (!sctp_new(ct, skb, sh, dataoff)) if (!sctp_new(ct, skb, sh, dataoff))
return -NF_ACCEPT; return -NF_ACCEPT;
} else { }
/* Check the verification tag (Sec 8.5) */
if (!test_bit(SCTP_CID_INIT, map) && /* Check the verification tag (Sec 8.5) */
!test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && if (!test_bit(SCTP_CID_INIT, map) &&
!test_bit(SCTP_CID_COOKIE_ECHO, map) && !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
!test_bit(SCTP_CID_ABORT, map) && !test_bit(SCTP_CID_COOKIE_ECHO, map) &&
!test_bit(SCTP_CID_SHUTDOWN_ACK, map) && !test_bit(SCTP_CID_ABORT, map) &&
!test_bit(SCTP_CID_HEARTBEAT, map) && !test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
!test_bit(SCTP_CID_HEARTBEAT_ACK, map) && !test_bit(SCTP_CID_HEARTBEAT, map) &&
sh->vtag != ct->proto.sctp.vtag[dir]) { !test_bit(SCTP_CID_HEARTBEAT_ACK, map) &&
pr_debug("Verification tag check failed\n"); sh->vtag != ct->proto.sctp.vtag[dir]) {
goto out; pr_debug("Verification tag check failed\n");
} goto out;
} }
old_state = new_state = SCTP_CONNTRACK_NONE; old_state = new_state = SCTP_CONNTRACK_NONE;
@ -483,11 +471,6 @@ int nf_conntrack_sctp_packet(struct nf_conn *ct,
} else if (ct->proto.sctp.flags & SCTP_FLAG_HEARTBEAT_VTAG_FAILED) { } else if (ct->proto.sctp.flags & SCTP_FLAG_HEARTBEAT_VTAG_FAILED) {
ct->proto.sctp.flags &= ~SCTP_FLAG_HEARTBEAT_VTAG_FAILED; ct->proto.sctp.flags &= ~SCTP_FLAG_HEARTBEAT_VTAG_FAILED;
} }
} else if (sch->type == SCTP_CID_DATA || sch->type == SCTP_CID_SACK) {
if (ct->proto.sctp.vtag[dir] == 0) {
pr_debug("Setting vtag %x for dir %d\n", sh->vtag, dir);
ct->proto.sctp.vtag[dir] = sh->vtag;
}
} }
old_state = ct->proto.sctp.state; old_state = ct->proto.sctp.state;
@ -708,7 +691,6 @@ sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = {
[CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 }, [CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 },
[CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 }, [CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 },
[CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 }, [CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 },
[CTA_TIMEOUT_SCTP_DATA_SENT] = { .type = NLA_U32 },
}; };
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */

8
net/netfilter/nf_conntrack_standalone.c
View File

@ -602,7 +602,6 @@ enum nf_ct_sysctl_index {
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT, NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_SENT, NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_SENT,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_ACKED, NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_HEARTBEAT_ACKED,
NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_DATA_SENT,
#endif #endif
#ifdef CONFIG_NF_CT_PROTO_DCCP #ifdef CONFIG_NF_CT_PROTO_DCCP
NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_REQUEST, NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_REQUEST,
@ -893,12 +892,6 @@ static struct ctl_table nf_ct_sysctl_table[] = {
.mode = 0644, .mode = 0644,
.proc_handler = proc_dointvec_jiffies, .proc_handler = proc_dointvec_jiffies,
}, },
[NF_SYSCTL_CT_PROTO_TIMEOUT_SCTP_DATA_SENT] = {
.procname = "nf_conntrack_sctp_timeout_data_sent",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
#endif #endif
#ifdef CONFIG_NF_CT_PROTO_DCCP #ifdef CONFIG_NF_CT_PROTO_DCCP
[NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_REQUEST] = { [NF_SYSCTL_CT_PROTO_TIMEOUT_DCCP_REQUEST] = {
@ -1043,7 +1036,6 @@ static void nf_conntrack_standalone_init_sctp_sysctl(struct net *net,
XASSIGN(SHUTDOWN_ACK_SENT, sn); XASSIGN(SHUTDOWN_ACK_SENT, sn);
XASSIGN(HEARTBEAT_SENT, sn); XASSIGN(HEARTBEAT_SENT, sn);
XASSIGN(HEARTBEAT_ACKED, sn); XASSIGN(HEARTBEAT_ACKED, sn);
XASSIGN(DATA_SENT, sn);
#undef XASSIGN #undef XASSIGN
#endif #endif
} }