diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_proto_sctp.c')
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_sctp.c | 746 |
1 files changed, 746 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c new file mode 100644 index 0000000..ae8c260 --- /dev/null +++ b/net/netfilter/nf_conntrack_proto_sctp.c @@ -0,0 +1,746 @@ +/* + * Connection tracking protocol helper module for SCTP. + * + * SCTP is defined in RFC 2960. References to various sections in this code + * are to this RFC. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/types.h> +#include <linux/timer.h> +#include <linux/netfilter.h> +#include <linux/module.h> +#include <linux/in.h> +#include <linux/ip.h> +#include <linux/sctp.h> +#include <linux/string.h> +#include <linux/seq_file.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> + +#include <net/netfilter/nf_conntrack.h> +#include <net/netfilter/nf_conntrack_l4proto.h> +#include <net/netfilter/nf_conntrack_ecache.h> + +/* Protects ct->proto.sctp */ +static DEFINE_RWLOCK(sctp_lock); + +/* FIXME: Examine ipfilter's timeouts and conntrack transitions more + closely. They're more complex. --RR + + And so for me for SCTP :D -Kiran */ + +static const char *const sctp_conntrack_names[] = { + "NONE", + "CLOSED", + "COOKIE_WAIT", + "COOKIE_ECHOED", + "ESTABLISHED", + "SHUTDOWN_SENT", + "SHUTDOWN_RECD", + "SHUTDOWN_ACK_SENT", +}; + +#define SECS * HZ +#define MINS * 60 SECS +#define HOURS * 60 MINS +#define DAYS * 24 HOURS + +static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = { + [SCTP_CONNTRACK_CLOSED] = 10 SECS, + [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS, + [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS, + [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS, + [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000, + [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000, + [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS, +}; + +#define sNO SCTP_CONNTRACK_NONE +#define sCL SCTP_CONNTRACK_CLOSED +#define sCW SCTP_CONNTRACK_COOKIE_WAIT +#define sCE SCTP_CONNTRACK_COOKIE_ECHOED +#define sES SCTP_CONNTRACK_ESTABLISHED +#define sSS SCTP_CONNTRACK_SHUTDOWN_SENT +#define sSR SCTP_CONNTRACK_SHUTDOWN_RECD +#define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT +#define sIV SCTP_CONNTRACK_MAX + +/* + These are the descriptions of the states: + +NOTE: These state names are tantalizingly similar to the states of an +SCTP endpoint. But the interpretation of the states is a little different, +considering that these are the states of the connection and not of an end +point. Please note the subtleties. -Kiran + +NONE - Nothing so far. +COOKIE WAIT - We have seen an INIT chunk in the original direction, or also + an INIT_ACK chunk in the reply direction. +COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction. +ESTABLISHED - We have seen a COOKIE_ACK in the reply direction. +SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction. +SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin. +SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite + to that of the SHUTDOWN chunk. +CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of + the SHUTDOWN chunk. Connection is closed. +*/ + +/* TODO + - I have assumed that the first INIT is in the original direction. + This messes things when an INIT comes in the reply direction in CLOSED + state. + - Check the error type in the reply dir before transitioning from +cookie echoed to closed. + - Sec 5.2.4 of RFC 2960 + - Multi Homing support. +*/ + +/* SCTP conntrack state transitions */ +static const u8 sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = { + { +/* ORIGINAL */ +/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ +/* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA}, +/* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA}, +/* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, +/* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA}, +/* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA}, +/* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/ +/* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */ +/* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */ +/* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL} + }, + { +/* REPLY */ +/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */ +/* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */ +/* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA}, +/* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL}, +/* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA}, +/* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA}, +/* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA}, +/* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */ +/* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA}, +/* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL} + } +}; + +static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff, + struct nf_conntrack_tuple *tuple) +{ + const struct sctphdr *hp; + struct sctphdr _hdr; + + /* Actually only need first 8 bytes. */ + hp = skb_header_pointer(skb, dataoff, 8, &_hdr); + if (hp == NULL) + return false; + + tuple->src.u.sctp.port = hp->source; + tuple->dst.u.sctp.port = hp->dest; + return true; +} + +static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple, + const struct nf_conntrack_tuple *orig) +{ + tuple->src.u.sctp.port = orig->dst.u.sctp.port; + tuple->dst.u.sctp.port = orig->src.u.sctp.port; + return true; +} + +/* Print out the per-protocol part of the tuple. */ +static int sctp_print_tuple(struct seq_file *s, + const struct nf_conntrack_tuple *tuple) +{ + return seq_printf(s, "sport=%hu dport=%hu ", + ntohs(tuple->src.u.sctp.port), + ntohs(tuple->dst.u.sctp.port)); +} + +/* Print out the private part of the conntrack. */ +static int sctp_print_conntrack(struct seq_file *s, const struct nf_conn *ct) +{ + enum sctp_conntrack state; + + read_lock_bh(&sctp_lock); + state = ct->proto.sctp.state; + read_unlock_bh(&sctp_lock); + + return seq_printf(s, "%s ", sctp_conntrack_names[state]); +} + +#define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \ +for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \ + (offset) < (skb)->len && \ + ((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \ + (offset) += (ntohs((sch)->length) + 3) & ~3, (count)++) + +/* Some validity checks to make sure the chunks are fine */ +static int do_basic_checks(struct nf_conn *ct, + const struct sk_buff *skb, + unsigned int dataoff, + unsigned long *map) +{ + u_int32_t offset, count; + sctp_chunkhdr_t _sch, *sch; + int flag; + + flag = 0; + + for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { + pr_debug("Chunk Num: %d Type: %d\n", count, sch->type); + + if (sch->type == SCTP_CID_INIT || + sch->type == SCTP_CID_INIT_ACK || + sch->type == SCTP_CID_SHUTDOWN_COMPLETE) + flag = 1; + + /* + * Cookie Ack/Echo chunks not the first OR + * Init / Init Ack / Shutdown compl chunks not the only chunks + * OR zero-length. + */ + if (((sch->type == SCTP_CID_COOKIE_ACK || + sch->type == SCTP_CID_COOKIE_ECHO || + flag) && + count != 0) || !sch->length) { + pr_debug("Basic checks failed\n"); + return 1; + } + + if (map) + set_bit(sch->type, map); + } + + pr_debug("Basic checks passed\n"); + return count == 0; +} + +static int sctp_new_state(enum ip_conntrack_dir dir, + enum sctp_conntrack cur_state, + int chunk_type) +{ + int i; + + pr_debug("Chunk type: %d\n", chunk_type); + + switch (chunk_type) { + case SCTP_CID_INIT: + pr_debug("SCTP_CID_INIT\n"); + i = 0; + break; + case SCTP_CID_INIT_ACK: + pr_debug("SCTP_CID_INIT_ACK\n"); + i = 1; + break; + case SCTP_CID_ABORT: + pr_debug("SCTP_CID_ABORT\n"); + i = 2; + break; + case SCTP_CID_SHUTDOWN: + pr_debug("SCTP_CID_SHUTDOWN\n"); + i = 3; + break; + case SCTP_CID_SHUTDOWN_ACK: + pr_debug("SCTP_CID_SHUTDOWN_ACK\n"); + i = 4; + break; + case SCTP_CID_ERROR: + pr_debug("SCTP_CID_ERROR\n"); + i = 5; + break; + case SCTP_CID_COOKIE_ECHO: + pr_debug("SCTP_CID_COOKIE_ECHO\n"); + i = 6; + break; + case SCTP_CID_COOKIE_ACK: + pr_debug("SCTP_CID_COOKIE_ACK\n"); + i = 7; + break; + case SCTP_CID_SHUTDOWN_COMPLETE: + pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n"); + i = 8; + break; + default: + /* Other chunks like DATA, SACK, HEARTBEAT and + its ACK do not cause a change in state */ + pr_debug("Unknown chunk type, Will stay in %s\n", + sctp_conntrack_names[cur_state]); + return cur_state; + } + + pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n", + dir, sctp_conntrack_names[cur_state], chunk_type, + sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]); + + return sctp_conntracks[dir][i][cur_state]; +} + +/* 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, + enum ip_conntrack_info ctinfo, + u_int8_t pf, + unsigned int hooknum) +{ + enum sctp_conntrack new_state, old_state; + enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); + const struct sctphdr *sh; + struct sctphdr _sctph; + const struct sctp_chunkhdr *sch; + struct sctp_chunkhdr _sch; + u_int32_t offset, count; + unsigned long map[256 / sizeof(unsigned long)] = { 0 }; + + sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); + if (sh == NULL) + goto out; + + if (do_basic_checks(ct, skb, dataoff, map) != 0) + goto out; + + /* Check the verification tag (Sec 8.5) */ + if (!test_bit(SCTP_CID_INIT, map) && + !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) && + !test_bit(SCTP_CID_COOKIE_ECHO, map) && + !test_bit(SCTP_CID_ABORT, map) && + !test_bit(SCTP_CID_SHUTDOWN_ACK, map) && + sh->vtag != ct->proto.sctp.vtag[dir]) { + pr_debug("Verification tag check failed\n"); + goto out; + } + + old_state = new_state = SCTP_CONNTRACK_MAX; + write_lock_bh(&sctp_lock); + for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { + /* 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) + 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]) + 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 & SCTP_CHUNK_FLAG_T) + goto out_unlock; + } else if (sch->type == SCTP_CID_COOKIE_ECHO) { + /* Sec 8.5.1 (D) */ + if (sh->vtag != ct->proto.sctp.vtag[dir]) + goto out_unlock; + } + + old_state = ct->proto.sctp.state; + new_state = sctp_new_state(dir, old_state, sch->type); + + /* Invalid */ + if (new_state == SCTP_CONNTRACK_MAX) { + pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u " + "conntrack=%u\n", + dir, sch->type, old_state); + goto out_unlock; + } + + /* If it is an INIT or an INIT ACK note down the vtag */ + if (sch->type == SCTP_CID_INIT || + sch->type == SCTP_CID_INIT_ACK) { + sctp_inithdr_t _inithdr, *ih; + + ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), + sizeof(_inithdr), &_inithdr); + 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; + } + + ct->proto.sctp.state = new_state; + if (old_state != new_state) + nf_conntrack_event_cache(IPCT_PROTOINFO, ct); + } + write_unlock_bh(&sctp_lock); + + nf_ct_refresh_acct(ct, ctinfo, skb, sctp_timeouts[new_state]); + + if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED && + dir == IP_CT_DIR_REPLY && + new_state == SCTP_CONNTRACK_ESTABLISHED) { + pr_debug("Setting assured bit\n"); + set_bit(IPS_ASSURED_BIT, &ct->status); + nf_conntrack_event_cache(IPCT_STATUS, ct); + } + + return NF_ACCEPT; + +out_unlock: + write_unlock_bh(&sctp_lock); +out: + return -NF_ACCEPT; +} + +/* Called when a new connection for this protocol found. */ +static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb, + unsigned int dataoff) +{ + enum sctp_conntrack new_state; + const struct sctphdr *sh; + struct sctphdr _sctph; + const struct sctp_chunkhdr *sch; + struct sctp_chunkhdr _sch; + u_int32_t offset, count; + unsigned long map[256 / sizeof(unsigned long)] = { 0 }; + + sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph); + if (sh == NULL) + return false; + + if (do_basic_checks(ct, skb, dataoff, map) != 0) + return false; + + /* If an OOTB packet has any of these chunks discard (Sec 8.4) */ + if (test_bit(SCTP_CID_ABORT, map) || + test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) || + test_bit(SCTP_CID_COOKIE_ACK, map)) + return false; + + new_state = SCTP_CONNTRACK_MAX; + for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) { + /* Don't need lock here: this conntrack not in circulation yet */ + new_state = sctp_new_state(IP_CT_DIR_ORIGINAL, + SCTP_CONNTRACK_NONE, sch->type); + + /* Invalid: delete conntrack */ + if (new_state == SCTP_CONNTRACK_NONE || + new_state == SCTP_CONNTRACK_MAX) { + pr_debug("nf_conntrack_sctp: invalid new deleting.\n"); + return false; + } + + /* Copy the vtag into the state info */ + if (sch->type == SCTP_CID_INIT) { + if (sh->vtag == 0) { + sctp_inithdr_t _inithdr, *ih; + + ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t), + sizeof(_inithdr), &_inithdr); + if (ih == NULL) + return false; + + pr_debug("Setting vtag %x for new conn\n", + ih->init_tag); + + ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = + ih->init_tag; + } else { + /* Sec 8.5.1 (A) */ + return false; + } + } + /* If it is a shutdown ack OOTB packet, we expect a return + shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */ + else { + pr_debug("Setting vtag %x for new conn OOTB\n", + sh->vtag); + ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag; + } + + ct->proto.sctp.state = new_state; + } + + return true; +} + +#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_conntrack.h> + +static int sctp_to_nlattr(struct sk_buff *skb, struct nlattr *nla, + const struct nf_conn *ct) +{ + struct nlattr *nest_parms; + + read_lock_bh(&sctp_lock); + nest_parms = nla_nest_start(skb, CTA_PROTOINFO_SCTP | NLA_F_NESTED); + if (!nest_parms) + goto nla_put_failure; + + NLA_PUT_U8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state); + + NLA_PUT_BE32(skb, + CTA_PROTOINFO_SCTP_VTAG_ORIGINAL, + ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]); + + NLA_PUT_BE32(skb, + CTA_PROTOINFO_SCTP_VTAG_REPLY, + ct->proto.sctp.vtag[IP_CT_DIR_REPLY]); + + read_unlock_bh(&sctp_lock); + + nla_nest_end(skb, nest_parms); + + return 0; + +nla_put_failure: + read_unlock_bh(&sctp_lock); + return -1; +} + +static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = { + [CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 }, + [CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 }, + [CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 }, +}; + +static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct) +{ + struct nlattr *attr = cda[CTA_PROTOINFO_SCTP]; + struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1]; + int err; + + /* updates may not contain the internal protocol info, skip parsing */ + if (!attr) + return 0; + + err = nla_parse_nested(tb, + CTA_PROTOINFO_SCTP_MAX, + attr, + sctp_nla_policy); + if (err < 0) + return err; + + if (!tb[CTA_PROTOINFO_SCTP_STATE] || + !tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] || + !tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]) + return -EINVAL; + + write_lock_bh(&sctp_lock); + ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]); + ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = + nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]); + ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = + nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]); + write_unlock_bh(&sctp_lock); + + return 0; +} +#endif + +#ifdef CONFIG_SYSCTL +static unsigned int sctp_sysctl_table_users; +static struct ctl_table_header *sctp_sysctl_header; +static struct ctl_table sctp_sysctl_table[] = { + { + .procname = "nf_conntrack_sctp_timeout_closed", + .data = &sctp_timeouts[SCTP_CONNTRACK_CLOSED], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "nf_conntrack_sctp_timeout_cookie_wait", + .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "nf_conntrack_sctp_timeout_cookie_echoed", + .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "nf_conntrack_sctp_timeout_established", + .data = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "nf_conntrack_sctp_timeout_shutdown_sent", + .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "nf_conntrack_sctp_timeout_shutdown_recd", + .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent", + .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .ctl_name = 0 + } +}; + +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT +static struct ctl_table sctp_compat_sysctl_table[] = { + { + .procname = "ip_conntrack_sctp_timeout_closed", + .data = &sctp_timeouts[SCTP_CONNTRACK_CLOSED], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "ip_conntrack_sctp_timeout_cookie_wait", + .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "ip_conntrack_sctp_timeout_cookie_echoed", + .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "ip_conntrack_sctp_timeout_established", + .data = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "ip_conntrack_sctp_timeout_shutdown_sent", + .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "ip_conntrack_sctp_timeout_shutdown_recd", + .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent", + .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT], + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = &proc_dointvec_jiffies, + }, + { + .ctl_name = 0 + } +}; +#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */ +#endif + +static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = { + .l3proto = PF_INET, + .l4proto = IPPROTO_SCTP, + .name = "sctp", + .pkt_to_tuple = sctp_pkt_to_tuple, + .invert_tuple = sctp_invert_tuple, + .print_tuple = sctp_print_tuple, + .print_conntrack = sctp_print_conntrack, + .packet = sctp_packet, + .new = sctp_new, + .me = THIS_MODULE, +#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) + .to_nlattr = sctp_to_nlattr, + .from_nlattr = nlattr_to_sctp, + .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, + .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, + .nla_policy = nf_ct_port_nla_policy, +#endif +#ifdef CONFIG_SYSCTL + .ctl_table_users = &sctp_sysctl_table_users, + .ctl_table_header = &sctp_sysctl_header, + .ctl_table = sctp_sysctl_table, +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT + .ctl_compat_table = sctp_compat_sysctl_table, +#endif +#endif +}; + +static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = { + .l3proto = PF_INET6, + .l4proto = IPPROTO_SCTP, + .name = "sctp", + .pkt_to_tuple = sctp_pkt_to_tuple, + .invert_tuple = sctp_invert_tuple, + .print_tuple = sctp_print_tuple, + .print_conntrack = sctp_print_conntrack, + .packet = sctp_packet, + .new = sctp_new, + .me = THIS_MODULE, +#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) + .to_nlattr = sctp_to_nlattr, + .from_nlattr = nlattr_to_sctp, + .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, + .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, + .nla_policy = nf_ct_port_nla_policy, +#endif +#ifdef CONFIG_SYSCTL + .ctl_table_users = &sctp_sysctl_table_users, + .ctl_table_header = &sctp_sysctl_header, + .ctl_table = sctp_sysctl_table, +#endif +}; + +static int __init nf_conntrack_proto_sctp_init(void) +{ + int ret; + + ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4); + if (ret) { + printk("nf_conntrack_l4proto_sctp4: protocol register failed\n"); + goto out; + } + ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6); + if (ret) { + printk("nf_conntrack_l4proto_sctp6: protocol register failed\n"); + goto cleanup_sctp4; + } + + return ret; + + cleanup_sctp4: + nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4); + out: + return ret; +} + +static void __exit nf_conntrack_proto_sctp_fini(void) +{ + nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6); + nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4); +} + +module_init(nf_conntrack_proto_sctp_init); +module_exit(nf_conntrack_proto_sctp_fini); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Kiran Kumar Immidi"); +MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP"); +MODULE_ALIAS("ip_conntrack_proto_sctp"); 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