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[NETFILTER]: nf_conntrack_sctp: consolidate sctp_packet() error paths

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Consolidate error paths and use proper symbolic return value instead
of magic values.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2008-01-14 23:46:52 -08:00 committed by David S. Miller
parent 8528819adc
commit b37e933ac7
1 changed files with 20 additions and 26 deletions
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46
net/netfilter/nf_conntrack_proto_sctp.c
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@ -291,7 +291,7 @@ static int new_state(enum ip_conntrack_dir dir,
return sctp_conntracks[dir][i][cur_state];
}
/* Returns verdict for packet, or -1 for invalid. */
/* Returns verdict for packet, or -NF_ACCEPT for invalid. */
static int sctp_packet(struct nf_conn *ct,
const struct sk_buff *skb,
unsigned int dataoff,
@ -308,10 +308,10 @@ static int sctp_packet(struct nf_conn *ct,
sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
if (sh == NULL)
return -1;
goto out;
if (do_basic_checks(ct, skb, dataoff, map) != 0)
return -1;
goto out;
/* Check the verification tag (Sec 8.5) */
if (!test_bit(SCTP_CID_INIT, map) &&
@ -321,7 +321,7 @@ static int sctp_packet(struct nf_conn *ct,
!test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
sh->vtag != ct->proto.sctp.vtag[dir]) {
pr_debug("Verification tag check failed\n");
return -1;
goto out;
}
oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
@ -331,31 +331,23 @@ static int sctp_packet(struct nf_conn *ct,
/* Special cases of Verification tag check (Sec 8.5.1) */
if (sch->type == SCTP_CID_INIT) {
/* Sec 8.5.1 (A) */
if (sh->vtag != 0) {
write_unlock_bh(&sctp_lock);
return -1;
}
if (sh->vtag != 0)
goto out_unlock;
} else if (sch->type == SCTP_CID_ABORT) {
/* Sec 8.5.1 (B) */
if (sh->vtag != ct->proto.sctp.vtag[dir] &&
sh->vtag != ct->proto.sctp.vtag[!dir]) {
write_unlock_bh(&sctp_lock);
return -1;
}
sh->vtag != ct->proto.sctp.vtag[!dir])
goto out_unlock;
} else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
/* Sec 8.5.1 (C) */
if (sh->vtag != ct->proto.sctp.vtag[dir] &&
sh->vtag != ct->proto.sctp.vtag[!dir] &&
(sch->flags & 1)) {
write_unlock_bh(&sctp_lock);
return -1;
}
(sch->flags & 1))
goto out_unlock;
} else if (sch->type == SCTP_CID_COOKIE_ECHO) {
/* Sec 8.5.1 (D) */
if (sh->vtag != ct->proto.sctp.vtag[dir]) {
write_unlock_bh(&sctp_lock);
return -1;
}
if (sh->vtag != ct->proto.sctp.vtag[dir])
goto out_unlock;
}
oldsctpstate = ct->proto.sctp.state;
@ -366,8 +358,7 @@ static int sctp_packet(struct nf_conn *ct,
pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
"conntrack=%u\n",
dir, sch->type, oldsctpstate);
write_unlock_bh(&sctp_lock);
return -1;
goto out_unlock;
}
/* If it is an INIT or an INIT ACK note down the vtag */
@ -377,10 +368,8 @@ static int sctp_packet(struct nf_conn *ct,
ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
sizeof(_inithdr), &_inithdr);
if (ih == NULL) {
write_unlock_bh(&sctp_lock);
return -1;
}
if (ih == NULL)
goto out_unlock;
pr_debug("Setting vtag %x for dir %d\n",
ih->init_tag, !dir);
ct->proto.sctp.vtag[!dir] = ih->init_tag;
@ -403,6 +392,11 @@ static int sctp_packet(struct nf_conn *ct,
}
return NF_ACCEPT;
out_unlock:
write_unlock_bh(&sctp_lock);
out:
return -NF_ACCEPT;
}
/* Called when a new connection for this protocol found. */