forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1162 lines
30 KiB
1162 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* DCCP over IPv6 |
|
* Linux INET6 implementation |
|
* |
|
* Based on net/dccp6/ipv6.c |
|
* |
|
* Arnaldo Carvalho de Melo <[email protected]> |
|
*/ |
|
|
|
#include <linux/module.h> |
|
#include <linux/random.h> |
|
#include <linux/slab.h> |
|
#include <linux/xfrm.h> |
|
#include <linux/string.h> |
|
|
|
#include <net/addrconf.h> |
|
#include <net/inet_common.h> |
|
#include <net/inet_hashtables.h> |
|
#include <net/inet_sock.h> |
|
#include <net/inet6_connection_sock.h> |
|
#include <net/inet6_hashtables.h> |
|
#include <net/ip6_route.h> |
|
#include <net/ipv6.h> |
|
#include <net/protocol.h> |
|
#include <net/transp_v6.h> |
|
#include <net/ip6_checksum.h> |
|
#include <net/xfrm.h> |
|
#include <net/secure_seq.h> |
|
#include <net/sock.h> |
|
|
|
#include "dccp.h" |
|
#include "ipv6.h" |
|
#include "feat.h" |
|
|
|
/* The per-net dccp.v6_ctl_sk is used for sending RSTs and ACKs */ |
|
|
|
static const struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
|
static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops; |
|
|
|
/* add pseudo-header to DCCP checksum stored in skb->csum */ |
|
static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
|
const struct in6_addr *saddr, |
|
const struct in6_addr *daddr) |
|
{ |
|
return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum); |
|
} |
|
|
|
static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct dccp_hdr *dh = dccp_hdr(skb); |
|
|
|
dccp_csum_outgoing(skb); |
|
dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &sk->sk_v6_daddr); |
|
} |
|
|
|
static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) |
|
{ |
|
return secure_dccpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
|
ipv6_hdr(skb)->saddr.s6_addr32, |
|
dccp_hdr(skb)->dccph_dport, |
|
dccp_hdr(skb)->dccph_sport ); |
|
|
|
} |
|
|
|
static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
|
u8 type, u8 code, int offset, __be32 info) |
|
{ |
|
const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
|
const struct dccp_hdr *dh; |
|
struct dccp_sock *dp; |
|
struct ipv6_pinfo *np; |
|
struct sock *sk; |
|
int err; |
|
__u64 seq; |
|
struct net *net = dev_net(skb->dev); |
|
|
|
/* Only need dccph_dport & dccph_sport which are the first |
|
* 4 bytes in dccp header. |
|
* Our caller (icmpv6_notify()) already pulled 8 bytes for us. |
|
*/ |
|
BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_sport) > 8); |
|
BUILD_BUG_ON(offsetofend(struct dccp_hdr, dccph_dport) > 8); |
|
dh = (struct dccp_hdr *)(skb->data + offset); |
|
|
|
sk = __inet6_lookup_established(net, &dccp_hashinfo, |
|
&hdr->daddr, dh->dccph_dport, |
|
&hdr->saddr, ntohs(dh->dccph_sport), |
|
inet6_iif(skb), 0); |
|
|
|
if (!sk) { |
|
__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
|
ICMP6_MIB_INERRORS); |
|
return -ENOENT; |
|
} |
|
|
|
if (sk->sk_state == DCCP_TIME_WAIT) { |
|
inet_twsk_put(inet_twsk(sk)); |
|
return 0; |
|
} |
|
seq = dccp_hdr_seq(dh); |
|
if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
|
dccp_req_err(sk, seq); |
|
return 0; |
|
} |
|
|
|
bh_lock_sock(sk); |
|
if (sock_owned_by_user(sk)) |
|
__NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
|
|
|
if (sk->sk_state == DCCP_CLOSED) |
|
goto out; |
|
|
|
dp = dccp_sk(sk); |
|
if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
|
!between48(seq, dp->dccps_awl, dp->dccps_awh)) { |
|
__NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
|
goto out; |
|
} |
|
|
|
np = inet6_sk(sk); |
|
|
|
if (type == NDISC_REDIRECT) { |
|
if (!sock_owned_by_user(sk)) { |
|
struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); |
|
|
|
if (dst) |
|
dst->ops->redirect(dst, sk, skb); |
|
} |
|
goto out; |
|
} |
|
|
|
if (type == ICMPV6_PKT_TOOBIG) { |
|
struct dst_entry *dst = NULL; |
|
|
|
if (!ip6_sk_accept_pmtu(sk)) |
|
goto out; |
|
|
|
if (sock_owned_by_user(sk)) |
|
goto out; |
|
if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) |
|
goto out; |
|
|
|
dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
|
if (!dst) |
|
goto out; |
|
|
|
if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) |
|
dccp_sync_mss(sk, dst_mtu(dst)); |
|
goto out; |
|
} |
|
|
|
icmpv6_err_convert(type, code, &err); |
|
|
|
/* Might be for an request_sock */ |
|
switch (sk->sk_state) { |
|
case DCCP_REQUESTING: |
|
case DCCP_RESPOND: /* Cannot happen. |
|
It can, it SYNs are crossed. --ANK */ |
|
if (!sock_owned_by_user(sk)) { |
|
__DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
|
sk->sk_err = err; |
|
/* |
|
* Wake people up to see the error |
|
* (see connect in sock.c) |
|
*/ |
|
sk->sk_error_report(sk); |
|
dccp_done(sk); |
|
} else |
|
sk->sk_err_soft = err; |
|
goto out; |
|
} |
|
|
|
if (!sock_owned_by_user(sk) && np->recverr) { |
|
sk->sk_err = err; |
|
sk->sk_error_report(sk); |
|
} else |
|
sk->sk_err_soft = err; |
|
|
|
out: |
|
bh_unlock_sock(sk); |
|
sock_put(sk); |
|
return 0; |
|
} |
|
|
|
|
|
static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req) |
|
{ |
|
struct inet_request_sock *ireq = inet_rsk(req); |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct sk_buff *skb; |
|
struct in6_addr *final_p, final; |
|
struct flowi6 fl6; |
|
int err = -1; |
|
struct dst_entry *dst; |
|
|
|
memset(&fl6, 0, sizeof(fl6)); |
|
fl6.flowi6_proto = IPPROTO_DCCP; |
|
fl6.daddr = ireq->ir_v6_rmt_addr; |
|
fl6.saddr = ireq->ir_v6_loc_addr; |
|
fl6.flowlabel = 0; |
|
fl6.flowi6_oif = ireq->ir_iif; |
|
fl6.fl6_dport = ireq->ir_rmt_port; |
|
fl6.fl6_sport = htons(ireq->ir_num); |
|
security_req_classify_flow(req, flowi6_to_flowi_common(&fl6)); |
|
|
|
|
|
rcu_read_lock(); |
|
final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt), &final); |
|
rcu_read_unlock(); |
|
|
|
dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); |
|
if (IS_ERR(dst)) { |
|
err = PTR_ERR(dst); |
|
dst = NULL; |
|
goto done; |
|
} |
|
|
|
skb = dccp_make_response(sk, dst, req); |
|
if (skb != NULL) { |
|
struct dccp_hdr *dh = dccp_hdr(skb); |
|
struct ipv6_txoptions *opt; |
|
|
|
dh->dccph_checksum = dccp_v6_csum_finish(skb, |
|
&ireq->ir_v6_loc_addr, |
|
&ireq->ir_v6_rmt_addr); |
|
fl6.daddr = ireq->ir_v6_rmt_addr; |
|
rcu_read_lock(); |
|
opt = ireq->ipv6_opt; |
|
if (!opt) |
|
opt = rcu_dereference(np->opt); |
|
err = ip6_xmit(sk, skb, &fl6, sk->sk_mark, opt, np->tclass, |
|
sk->sk_priority); |
|
rcu_read_unlock(); |
|
err = net_xmit_eval(err); |
|
} |
|
|
|
done: |
|
dst_release(dst); |
|
return err; |
|
} |
|
|
|
static void dccp_v6_reqsk_destructor(struct request_sock *req) |
|
{ |
|
dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); |
|
kfree(inet_rsk(req)->ipv6_opt); |
|
kfree_skb(inet_rsk(req)->pktopts); |
|
} |
|
|
|
static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb) |
|
{ |
|
const struct ipv6hdr *rxip6h; |
|
struct sk_buff *skb; |
|
struct flowi6 fl6; |
|
struct net *net = dev_net(skb_dst(rxskb)->dev); |
|
struct sock *ctl_sk = net->dccp.v6_ctl_sk; |
|
struct dst_entry *dst; |
|
|
|
if (dccp_hdr(rxskb)->dccph_type == DCCP_PKT_RESET) |
|
return; |
|
|
|
if (!ipv6_unicast_destination(rxskb)) |
|
return; |
|
|
|
skb = dccp_ctl_make_reset(ctl_sk, rxskb); |
|
if (skb == NULL) |
|
return; |
|
|
|
rxip6h = ipv6_hdr(rxskb); |
|
dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, &rxip6h->saddr, |
|
&rxip6h->daddr); |
|
|
|
memset(&fl6, 0, sizeof(fl6)); |
|
fl6.daddr = rxip6h->saddr; |
|
fl6.saddr = rxip6h->daddr; |
|
|
|
fl6.flowi6_proto = IPPROTO_DCCP; |
|
fl6.flowi6_oif = inet6_iif(rxskb); |
|
fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
|
fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; |
|
security_skb_classify_flow(rxskb, flowi6_to_flowi_common(&fl6)); |
|
|
|
/* sk = NULL, but it is safe for now. RST socket required. */ |
|
dst = ip6_dst_lookup_flow(sock_net(ctl_sk), ctl_sk, &fl6, NULL); |
|
if (!IS_ERR(dst)) { |
|
skb_dst_set(skb, dst); |
|
ip6_xmit(ctl_sk, skb, &fl6, 0, NULL, 0, 0); |
|
DCCP_INC_STATS(DCCP_MIB_OUTSEGS); |
|
DCCP_INC_STATS(DCCP_MIB_OUTRSTS); |
|
return; |
|
} |
|
|
|
kfree_skb(skb); |
|
} |
|
|
|
static struct request_sock_ops dccp6_request_sock_ops = { |
|
.family = AF_INET6, |
|
.obj_size = sizeof(struct dccp6_request_sock), |
|
.rtx_syn_ack = dccp_v6_send_response, |
|
.send_ack = dccp_reqsk_send_ack, |
|
.destructor = dccp_v6_reqsk_destructor, |
|
.send_reset = dccp_v6_ctl_send_reset, |
|
.syn_ack_timeout = dccp_syn_ack_timeout, |
|
}; |
|
|
|
static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct request_sock *req; |
|
struct dccp_request_sock *dreq; |
|
struct inet_request_sock *ireq; |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
|
struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
|
|
|
if (skb->protocol == htons(ETH_P_IP)) |
|
return dccp_v4_conn_request(sk, skb); |
|
|
|
if (!ipv6_unicast_destination(skb)) |
|
return 0; /* discard, don't send a reset here */ |
|
|
|
if (ipv6_addr_v4mapped(&ipv6_hdr(skb)->saddr)) { |
|
__IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS); |
|
return 0; |
|
} |
|
|
|
if (dccp_bad_service_code(sk, service)) { |
|
dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
|
goto drop; |
|
} |
|
/* |
|
* There are no SYN attacks on IPv6, yet... |
|
*/ |
|
dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
|
if (inet_csk_reqsk_queue_is_full(sk)) |
|
goto drop; |
|
|
|
if (sk_acceptq_is_full(sk)) |
|
goto drop; |
|
|
|
req = inet_reqsk_alloc(&dccp6_request_sock_ops, sk, true); |
|
if (req == NULL) |
|
goto drop; |
|
|
|
if (dccp_reqsk_init(req, dccp_sk(sk), skb)) |
|
goto drop_and_free; |
|
|
|
dreq = dccp_rsk(req); |
|
if (dccp_parse_options(sk, dreq, skb)) |
|
goto drop_and_free; |
|
|
|
if (security_inet_conn_request(sk, skb, req)) |
|
goto drop_and_free; |
|
|
|
ireq = inet_rsk(req); |
|
ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; |
|
ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; |
|
ireq->ireq_family = AF_INET6; |
|
ireq->ir_mark = inet_request_mark(sk, skb); |
|
|
|
if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
|
np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
|
np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { |
|
refcount_inc(&skb->users); |
|
ireq->pktopts = skb; |
|
} |
|
ireq->ir_iif = sk->sk_bound_dev_if; |
|
|
|
/* So that link locals have meaning */ |
|
if (!sk->sk_bound_dev_if && |
|
ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
|
ireq->ir_iif = inet6_iif(skb); |
|
|
|
/* |
|
* Step 3: Process LISTEN state |
|
* |
|
* Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
|
* |
|
* Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
|
*/ |
|
dreq->dreq_isr = dcb->dccpd_seq; |
|
dreq->dreq_gsr = dreq->dreq_isr; |
|
dreq->dreq_iss = dccp_v6_init_sequence(skb); |
|
dreq->dreq_gss = dreq->dreq_iss; |
|
dreq->dreq_service = service; |
|
|
|
if (dccp_v6_send_response(sk, req)) |
|
goto drop_and_free; |
|
|
|
inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); |
|
reqsk_put(req); |
|
return 0; |
|
|
|
drop_and_free: |
|
reqsk_free(req); |
|
drop: |
|
__DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
|
return -1; |
|
} |
|
|
|
static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, |
|
struct sk_buff *skb, |
|
struct request_sock *req, |
|
struct dst_entry *dst, |
|
struct request_sock *req_unhash, |
|
bool *own_req) |
|
{ |
|
struct inet_request_sock *ireq = inet_rsk(req); |
|
struct ipv6_pinfo *newnp; |
|
const struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct ipv6_txoptions *opt; |
|
struct inet_sock *newinet; |
|
struct dccp6_sock *newdp6; |
|
struct sock *newsk; |
|
|
|
if (skb->protocol == htons(ETH_P_IP)) { |
|
/* |
|
* v6 mapped |
|
*/ |
|
newsk = dccp_v4_request_recv_sock(sk, skb, req, dst, |
|
req_unhash, own_req); |
|
if (newsk == NULL) |
|
return NULL; |
|
|
|
newdp6 = (struct dccp6_sock *)newsk; |
|
newinet = inet_sk(newsk); |
|
newinet->pinet6 = &newdp6->inet6; |
|
newnp = inet6_sk(newsk); |
|
|
|
memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
|
|
|
newnp->saddr = newsk->sk_v6_rcv_saddr; |
|
|
|
inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped; |
|
newsk->sk_backlog_rcv = dccp_v4_do_rcv; |
|
newnp->pktoptions = NULL; |
|
newnp->opt = NULL; |
|
newnp->ipv6_mc_list = NULL; |
|
newnp->ipv6_ac_list = NULL; |
|
newnp->ipv6_fl_list = NULL; |
|
newnp->mcast_oif = inet_iif(skb); |
|
newnp->mcast_hops = ip_hdr(skb)->ttl; |
|
|
|
/* |
|
* No need to charge this sock to the relevant IPv6 refcnt debug socks count |
|
* here, dccp_create_openreq_child now does this for us, see the comment in |
|
* that function for the gory details. -acme |
|
*/ |
|
|
|
/* It is tricky place. Until this moment IPv4 tcp |
|
worked with IPv6 icsk.icsk_af_ops. |
|
Sync it now. |
|
*/ |
|
dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
|
|
|
return newsk; |
|
} |
|
|
|
|
|
if (sk_acceptq_is_full(sk)) |
|
goto out_overflow; |
|
|
|
if (!dst) { |
|
struct flowi6 fl6; |
|
|
|
dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_DCCP); |
|
if (!dst) |
|
goto out; |
|
} |
|
|
|
newsk = dccp_create_openreq_child(sk, req, skb); |
|
if (newsk == NULL) |
|
goto out_nonewsk; |
|
|
|
/* |
|
* No need to charge this sock to the relevant IPv6 refcnt debug socks |
|
* count here, dccp_create_openreq_child now does this for us, see the |
|
* comment in that function for the gory details. -acme |
|
*/ |
|
|
|
ip6_dst_store(newsk, dst, NULL, NULL); |
|
newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
|
NETIF_F_TSO); |
|
newdp6 = (struct dccp6_sock *)newsk; |
|
newinet = inet_sk(newsk); |
|
newinet->pinet6 = &newdp6->inet6; |
|
newnp = inet6_sk(newsk); |
|
|
|
memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
|
|
|
newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
|
newnp->saddr = ireq->ir_v6_loc_addr; |
|
newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; |
|
newsk->sk_bound_dev_if = ireq->ir_iif; |
|
|
|
/* Now IPv6 options... |
|
|
|
First: no IPv4 options. |
|
*/ |
|
newinet->inet_opt = NULL; |
|
|
|
/* Clone RX bits */ |
|
newnp->rxopt.all = np->rxopt.all; |
|
|
|
newnp->ipv6_mc_list = NULL; |
|
newnp->ipv6_ac_list = NULL; |
|
newnp->ipv6_fl_list = NULL; |
|
newnp->pktoptions = NULL; |
|
newnp->opt = NULL; |
|
newnp->mcast_oif = inet6_iif(skb); |
|
newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
|
|
|
/* |
|
* Clone native IPv6 options from listening socket (if any) |
|
* |
|
* Yes, keeping reference count would be much more clever, but we make |
|
* one more one thing there: reattach optmem to newsk. |
|
*/ |
|
opt = ireq->ipv6_opt; |
|
if (!opt) |
|
opt = rcu_dereference(np->opt); |
|
if (opt) { |
|
opt = ipv6_dup_options(newsk, opt); |
|
RCU_INIT_POINTER(newnp->opt, opt); |
|
} |
|
inet_csk(newsk)->icsk_ext_hdr_len = 0; |
|
if (opt) |
|
inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + |
|
opt->opt_flen; |
|
|
|
dccp_sync_mss(newsk, dst_mtu(dst)); |
|
|
|
newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
|
newinet->inet_rcv_saddr = LOOPBACK4_IPV6; |
|
|
|
if (__inet_inherit_port(sk, newsk) < 0) { |
|
inet_csk_prepare_forced_close(newsk); |
|
dccp_done(newsk); |
|
goto out; |
|
} |
|
*own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash), NULL); |
|
/* Clone pktoptions received with SYN, if we own the req */ |
|
if (*own_req && ireq->pktopts) { |
|
newnp->pktoptions = skb_clone(ireq->pktopts, GFP_ATOMIC); |
|
consume_skb(ireq->pktopts); |
|
ireq->pktopts = NULL; |
|
if (newnp->pktoptions) |
|
skb_set_owner_r(newnp->pktoptions, newsk); |
|
} |
|
|
|
return newsk; |
|
|
|
out_overflow: |
|
__NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
|
out_nonewsk: |
|
dst_release(dst); |
|
out: |
|
__NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS); |
|
return NULL; |
|
} |
|
|
|
/* The socket must have it's spinlock held when we get |
|
* here. |
|
* |
|
* We have a potential double-lock case here, so even when |
|
* doing backlog processing we use the BH locking scheme. |
|
* This is because we cannot sleep with the original spinlock |
|
* held. |
|
*/ |
|
static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct sk_buff *opt_skb = NULL; |
|
|
|
/* Imagine: socket is IPv6. IPv4 packet arrives, |
|
goes to IPv4 receive handler and backlogged. |
|
From backlog it always goes here. Kerboom... |
|
Fortunately, dccp_rcv_established and rcv_established |
|
handle them correctly, but it is not case with |
|
dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK |
|
*/ |
|
|
|
if (skb->protocol == htons(ETH_P_IP)) |
|
return dccp_v4_do_rcv(sk, skb); |
|
|
|
if (sk_filter(sk, skb)) |
|
goto discard; |
|
|
|
/* |
|
* socket locking is here for SMP purposes as backlog rcv is currently |
|
* called with bh processing disabled. |
|
*/ |
|
|
|
/* Do Stevens' IPV6_PKTOPTIONS. |
|
|
|
Yes, guys, it is the only place in our code, where we |
|
may make it not affecting IPv4. |
|
The rest of code is protocol independent, |
|
and I do not like idea to uglify IPv4. |
|
|
|
Actually, all the idea behind IPV6_PKTOPTIONS |
|
looks not very well thought. For now we latch |
|
options, received in the last packet, enqueued |
|
by tcp. Feel free to propose better solution. |
|
--ANK (980728) |
|
*/ |
|
if (np->rxopt.all) |
|
opt_skb = skb_clone(skb, GFP_ATOMIC); |
|
|
|
if (sk->sk_state == DCCP_OPEN) { /* Fast path */ |
|
if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len)) |
|
goto reset; |
|
if (opt_skb) |
|
goto ipv6_pktoptions; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Step 3: Process LISTEN state |
|
* If S.state == LISTEN, |
|
* If P.type == Request or P contains a valid Init Cookie option, |
|
* (* Must scan the packet's options to check for Init |
|
* Cookies. Only Init Cookies are processed here, |
|
* however; other options are processed in Step 8. This |
|
* scan need only be performed if the endpoint uses Init |
|
* Cookies *) |
|
* (* Generate a new socket and switch to that socket *) |
|
* Set S := new socket for this port pair |
|
* S.state = RESPOND |
|
* Choose S.ISS (initial seqno) or set from Init Cookies |
|
* Initialize S.GAR := S.ISS |
|
* Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies |
|
* Continue with S.state == RESPOND |
|
* (* A Response packet will be generated in Step 11 *) |
|
* Otherwise, |
|
* Generate Reset(No Connection) unless P.type == Reset |
|
* Drop packet and return |
|
* |
|
* NOTE: the check for the packet types is done in |
|
* dccp_rcv_state_process |
|
*/ |
|
|
|
if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len)) |
|
goto reset; |
|
if (opt_skb) |
|
goto ipv6_pktoptions; |
|
return 0; |
|
|
|
reset: |
|
dccp_v6_ctl_send_reset(sk, skb); |
|
discard: |
|
if (opt_skb != NULL) |
|
__kfree_skb(opt_skb); |
|
kfree_skb(skb); |
|
return 0; |
|
|
|
/* Handling IPV6_PKTOPTIONS skb the similar |
|
* way it's done for net/ipv6/tcp_ipv6.c |
|
*/ |
|
ipv6_pktoptions: |
|
if (!((1 << sk->sk_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) { |
|
if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
|
np->mcast_oif = inet6_iif(opt_skb); |
|
if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
|
np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
|
if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
|
np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
|
if (np->repflow) |
|
np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); |
|
if (ipv6_opt_accepted(sk, opt_skb, |
|
&DCCP_SKB_CB(opt_skb)->header.h6)) { |
|
skb_set_owner_r(opt_skb, sk); |
|
memmove(IP6CB(opt_skb), |
|
&DCCP_SKB_CB(opt_skb)->header.h6, |
|
sizeof(struct inet6_skb_parm)); |
|
opt_skb = xchg(&np->pktoptions, opt_skb); |
|
} else { |
|
__kfree_skb(opt_skb); |
|
opt_skb = xchg(&np->pktoptions, NULL); |
|
} |
|
} |
|
|
|
kfree_skb(opt_skb); |
|
return 0; |
|
} |
|
|
|
static int dccp_v6_rcv(struct sk_buff *skb) |
|
{ |
|
const struct dccp_hdr *dh; |
|
bool refcounted; |
|
struct sock *sk; |
|
int min_cov; |
|
|
|
/* Step 1: Check header basics */ |
|
|
|
if (dccp_invalid_packet(skb)) |
|
goto discard_it; |
|
|
|
/* Step 1: If header checksum is incorrect, drop packet and return. */ |
|
if (dccp_v6_csum_finish(skb, &ipv6_hdr(skb)->saddr, |
|
&ipv6_hdr(skb)->daddr)) { |
|
DCCP_WARN("dropped packet with invalid checksum\n"); |
|
goto discard_it; |
|
} |
|
|
|
dh = dccp_hdr(skb); |
|
|
|
DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
|
DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
|
|
|
if (dccp_packet_without_ack(skb)) |
|
DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; |
|
else |
|
DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); |
|
|
|
lookup: |
|
sk = __inet6_lookup_skb(&dccp_hashinfo, skb, __dccp_hdr_len(dh), |
|
dh->dccph_sport, dh->dccph_dport, |
|
inet6_iif(skb), 0, &refcounted); |
|
if (!sk) { |
|
dccp_pr_debug("failed to look up flow ID in table and " |
|
"get corresponding socket\n"); |
|
goto no_dccp_socket; |
|
} |
|
|
|
/* |
|
* Step 2: |
|
* ... or S.state == TIMEWAIT, |
|
* Generate Reset(No Connection) unless P.type == Reset |
|
* Drop packet and return |
|
*/ |
|
if (sk->sk_state == DCCP_TIME_WAIT) { |
|
dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n"); |
|
inet_twsk_put(inet_twsk(sk)); |
|
goto no_dccp_socket; |
|
} |
|
|
|
if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
|
struct request_sock *req = inet_reqsk(sk); |
|
struct sock *nsk; |
|
|
|
sk = req->rsk_listener; |
|
if (unlikely(sk->sk_state != DCCP_LISTEN)) { |
|
inet_csk_reqsk_queue_drop_and_put(sk, req); |
|
goto lookup; |
|
} |
|
sock_hold(sk); |
|
refcounted = true; |
|
nsk = dccp_check_req(sk, skb, req); |
|
if (!nsk) { |
|
reqsk_put(req); |
|
goto discard_and_relse; |
|
} |
|
if (nsk == sk) { |
|
reqsk_put(req); |
|
} else if (dccp_child_process(sk, nsk, skb)) { |
|
dccp_v6_ctl_send_reset(sk, skb); |
|
goto discard_and_relse; |
|
} else { |
|
sock_put(sk); |
|
return 0; |
|
} |
|
} |
|
/* |
|
* RFC 4340, sec. 9.2.1: Minimum Checksum Coverage |
|
* o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
|
* o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov |
|
*/ |
|
min_cov = dccp_sk(sk)->dccps_pcrlen; |
|
if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { |
|
dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n", |
|
dh->dccph_cscov, min_cov); |
|
/* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ |
|
goto discard_and_relse; |
|
} |
|
|
|
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
|
goto discard_and_relse; |
|
|
|
return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4, |
|
refcounted) ? -1 : 0; |
|
|
|
no_dccp_socket: |
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
|
goto discard_it; |
|
/* |
|
* Step 2: |
|
* If no socket ... |
|
* Generate Reset(No Connection) unless P.type == Reset |
|
* Drop packet and return |
|
*/ |
|
if (dh->dccph_type != DCCP_PKT_RESET) { |
|
DCCP_SKB_CB(skb)->dccpd_reset_code = |
|
DCCP_RESET_CODE_NO_CONNECTION; |
|
dccp_v6_ctl_send_reset(sk, skb); |
|
} |
|
|
|
discard_it: |
|
kfree_skb(skb); |
|
return 0; |
|
|
|
discard_and_relse: |
|
if (refcounted) |
|
sock_put(sk); |
|
goto discard_it; |
|
} |
|
|
|
static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
|
int addr_len) |
|
{ |
|
struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; |
|
struct inet_connection_sock *icsk = inet_csk(sk); |
|
struct inet_sock *inet = inet_sk(sk); |
|
struct ipv6_pinfo *np = inet6_sk(sk); |
|
struct dccp_sock *dp = dccp_sk(sk); |
|
struct in6_addr *saddr = NULL, *final_p, final; |
|
struct ipv6_txoptions *opt; |
|
struct flowi6 fl6; |
|
struct dst_entry *dst; |
|
int addr_type; |
|
int err; |
|
|
|
dp->dccps_role = DCCP_ROLE_CLIENT; |
|
|
|
if (addr_len < SIN6_LEN_RFC2133) |
|
return -EINVAL; |
|
|
|
if (usin->sin6_family != AF_INET6) |
|
return -EAFNOSUPPORT; |
|
|
|
memset(&fl6, 0, sizeof(fl6)); |
|
|
|
if (np->sndflow) { |
|
fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
|
IP6_ECN_flow_init(fl6.flowlabel); |
|
if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { |
|
struct ip6_flowlabel *flowlabel; |
|
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
|
if (IS_ERR(flowlabel)) |
|
return -EINVAL; |
|
fl6_sock_release(flowlabel); |
|
} |
|
} |
|
/* |
|
* connect() to INADDR_ANY means loopback (BSD'ism). |
|
*/ |
|
if (ipv6_addr_any(&usin->sin6_addr)) |
|
usin->sin6_addr.s6_addr[15] = 1; |
|
|
|
addr_type = ipv6_addr_type(&usin->sin6_addr); |
|
|
|
if (addr_type & IPV6_ADDR_MULTICAST) |
|
return -ENETUNREACH; |
|
|
|
if (addr_type & IPV6_ADDR_LINKLOCAL) { |
|
if (addr_len >= sizeof(struct sockaddr_in6) && |
|
usin->sin6_scope_id) { |
|
/* If interface is set while binding, indices |
|
* must coincide. |
|
*/ |
|
if (sk->sk_bound_dev_if && |
|
sk->sk_bound_dev_if != usin->sin6_scope_id) |
|
return -EINVAL; |
|
|
|
sk->sk_bound_dev_if = usin->sin6_scope_id; |
|
} |
|
|
|
/* Connect to link-local address requires an interface */ |
|
if (!sk->sk_bound_dev_if) |
|
return -EINVAL; |
|
} |
|
|
|
sk->sk_v6_daddr = usin->sin6_addr; |
|
np->flow_label = fl6.flowlabel; |
|
|
|
/* |
|
* DCCP over IPv4 |
|
*/ |
|
if (addr_type == IPV6_ADDR_MAPPED) { |
|
u32 exthdrlen = icsk->icsk_ext_hdr_len; |
|
struct sockaddr_in sin; |
|
|
|
SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
|
|
|
if (__ipv6_only_sock(sk)) |
|
return -ENETUNREACH; |
|
|
|
sin.sin_family = AF_INET; |
|
sin.sin_port = usin->sin6_port; |
|
sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
|
|
|
icsk->icsk_af_ops = &dccp_ipv6_mapped; |
|
sk->sk_backlog_rcv = dccp_v4_do_rcv; |
|
|
|
err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
|
if (err) { |
|
icsk->icsk_ext_hdr_len = exthdrlen; |
|
icsk->icsk_af_ops = &dccp_ipv6_af_ops; |
|
sk->sk_backlog_rcv = dccp_v6_do_rcv; |
|
goto failure; |
|
} |
|
np->saddr = sk->sk_v6_rcv_saddr; |
|
return err; |
|
} |
|
|
|
if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
|
saddr = &sk->sk_v6_rcv_saddr; |
|
|
|
fl6.flowi6_proto = IPPROTO_DCCP; |
|
fl6.daddr = sk->sk_v6_daddr; |
|
fl6.saddr = saddr ? *saddr : np->saddr; |
|
fl6.flowi6_oif = sk->sk_bound_dev_if; |
|
fl6.fl6_dport = usin->sin6_port; |
|
fl6.fl6_sport = inet->inet_sport; |
|
security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); |
|
|
|
opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
|
final_p = fl6_update_dst(&fl6, opt, &final); |
|
|
|
dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); |
|
if (IS_ERR(dst)) { |
|
err = PTR_ERR(dst); |
|
goto failure; |
|
} |
|
|
|
if (saddr == NULL) { |
|
saddr = &fl6.saddr; |
|
sk->sk_v6_rcv_saddr = *saddr; |
|
} |
|
|
|
/* set the source address */ |
|
np->saddr = *saddr; |
|
inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
|
|
|
ip6_dst_store(sk, dst, NULL, NULL); |
|
|
|
icsk->icsk_ext_hdr_len = 0; |
|
if (opt) |
|
icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; |
|
|
|
inet->inet_dport = usin->sin6_port; |
|
|
|
dccp_set_state(sk, DCCP_REQUESTING); |
|
err = inet6_hash_connect(&dccp_death_row, sk); |
|
if (err) |
|
goto late_failure; |
|
|
|
dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32, |
|
sk->sk_v6_daddr.s6_addr32, |
|
inet->inet_sport, |
|
inet->inet_dport); |
|
err = dccp_connect(sk); |
|
if (err) |
|
goto late_failure; |
|
|
|
return 0; |
|
|
|
late_failure: |
|
dccp_set_state(sk, DCCP_CLOSED); |
|
__sk_dst_reset(sk); |
|
failure: |
|
inet->inet_dport = 0; |
|
sk->sk_route_caps = 0; |
|
return err; |
|
} |
|
|
|
static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
|
.queue_xmit = inet6_csk_xmit, |
|
.send_check = dccp_v6_send_check, |
|
.rebuild_header = inet6_sk_rebuild_header, |
|
.conn_request = dccp_v6_conn_request, |
|
.syn_recv_sock = dccp_v6_request_recv_sock, |
|
.net_header_len = sizeof(struct ipv6hdr), |
|
.setsockopt = ipv6_setsockopt, |
|
.getsockopt = ipv6_getsockopt, |
|
.addr2sockaddr = inet6_csk_addr2sockaddr, |
|
.sockaddr_len = sizeof(struct sockaddr_in6), |
|
}; |
|
|
|
/* |
|
* DCCP over IPv4 via INET6 API |
|
*/ |
|
static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
|
.queue_xmit = ip_queue_xmit, |
|
.send_check = dccp_v4_send_check, |
|
.rebuild_header = inet_sk_rebuild_header, |
|
.conn_request = dccp_v6_conn_request, |
|
.syn_recv_sock = dccp_v6_request_recv_sock, |
|
.net_header_len = sizeof(struct iphdr), |
|
.setsockopt = ipv6_setsockopt, |
|
.getsockopt = ipv6_getsockopt, |
|
.addr2sockaddr = inet6_csk_addr2sockaddr, |
|
.sockaddr_len = sizeof(struct sockaddr_in6), |
|
}; |
|
|
|
/* NOTE: A lot of things set to zero explicitly by call to |
|
* sk_alloc() so need not be done here. |
|
*/ |
|
static int dccp_v6_init_sock(struct sock *sk) |
|
{ |
|
static __u8 dccp_v6_ctl_sock_initialized; |
|
int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized); |
|
|
|
if (err == 0) { |
|
if (unlikely(!dccp_v6_ctl_sock_initialized)) |
|
dccp_v6_ctl_sock_initialized = 1; |
|
inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static void dccp_v6_destroy_sock(struct sock *sk) |
|
{ |
|
dccp_destroy_sock(sk); |
|
inet6_destroy_sock(sk); |
|
} |
|
|
|
static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
|
.twsk_obj_size = sizeof(struct dccp6_timewait_sock), |
|
}; |
|
|
|
static struct proto dccp_v6_prot = { |
|
.name = "DCCPv6", |
|
.owner = THIS_MODULE, |
|
.close = dccp_close, |
|
.connect = dccp_v6_connect, |
|
.disconnect = dccp_disconnect, |
|
.ioctl = dccp_ioctl, |
|
.init = dccp_v6_init_sock, |
|
.setsockopt = dccp_setsockopt, |
|
.getsockopt = dccp_getsockopt, |
|
.sendmsg = dccp_sendmsg, |
|
.recvmsg = dccp_recvmsg, |
|
.backlog_rcv = dccp_v6_do_rcv, |
|
.hash = inet6_hash, |
|
.unhash = inet_unhash, |
|
.accept = inet_csk_accept, |
|
.get_port = inet_csk_get_port, |
|
.shutdown = dccp_shutdown, |
|
.destroy = dccp_v6_destroy_sock, |
|
.orphan_count = &dccp_orphan_count, |
|
.max_header = MAX_DCCP_HEADER, |
|
.obj_size = sizeof(struct dccp6_sock), |
|
.slab_flags = SLAB_TYPESAFE_BY_RCU, |
|
.rsk_prot = &dccp6_request_sock_ops, |
|
.twsk_prot = &dccp6_timewait_sock_ops, |
|
.h.hashinfo = &dccp_hashinfo, |
|
}; |
|
|
|
static const struct inet6_protocol dccp_v6_protocol = { |
|
.handler = dccp_v6_rcv, |
|
.err_handler = dccp_v6_err, |
|
.flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, |
|
}; |
|
|
|
static const struct proto_ops inet6_dccp_ops = { |
|
.family = PF_INET6, |
|
.owner = THIS_MODULE, |
|
.release = inet6_release, |
|
.bind = inet6_bind, |
|
.connect = inet_stream_connect, |
|
.socketpair = sock_no_socketpair, |
|
.accept = inet_accept, |
|
.getname = inet6_getname, |
|
.poll = dccp_poll, |
|
.ioctl = inet6_ioctl, |
|
.gettstamp = sock_gettstamp, |
|
.listen = inet_dccp_listen, |
|
.shutdown = inet_shutdown, |
|
.setsockopt = sock_common_setsockopt, |
|
.getsockopt = sock_common_getsockopt, |
|
.sendmsg = inet_sendmsg, |
|
.recvmsg = sock_common_recvmsg, |
|
.mmap = sock_no_mmap, |
|
.sendpage = sock_no_sendpage, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = inet6_compat_ioctl, |
|
#endif |
|
}; |
|
|
|
static struct inet_protosw dccp_v6_protosw = { |
|
.type = SOCK_DCCP, |
|
.protocol = IPPROTO_DCCP, |
|
.prot = &dccp_v6_prot, |
|
.ops = &inet6_dccp_ops, |
|
.flags = INET_PROTOSW_ICSK, |
|
}; |
|
|
|
static int __net_init dccp_v6_init_net(struct net *net) |
|
{ |
|
if (dccp_hashinfo.bhash == NULL) |
|
return -ESOCKTNOSUPPORT; |
|
|
|
return inet_ctl_sock_create(&net->dccp.v6_ctl_sk, PF_INET6, |
|
SOCK_DCCP, IPPROTO_DCCP, net); |
|
} |
|
|
|
static void __net_exit dccp_v6_exit_net(struct net *net) |
|
{ |
|
inet_ctl_sock_destroy(net->dccp.v6_ctl_sk); |
|
} |
|
|
|
static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list) |
|
{ |
|
inet_twsk_purge(&dccp_hashinfo, AF_INET6); |
|
} |
|
|
|
static struct pernet_operations dccp_v6_ops = { |
|
.init = dccp_v6_init_net, |
|
.exit = dccp_v6_exit_net, |
|
.exit_batch = dccp_v6_exit_batch, |
|
}; |
|
|
|
static int __init dccp_v6_init(void) |
|
{ |
|
int err = proto_register(&dccp_v6_prot, 1); |
|
|
|
if (err) |
|
goto out; |
|
|
|
inet6_register_protosw(&dccp_v6_protosw); |
|
|
|
err = register_pernet_subsys(&dccp_v6_ops); |
|
if (err) |
|
goto out_destroy_ctl_sock; |
|
|
|
err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
|
if (err) |
|
goto out_unregister_proto; |
|
|
|
out: |
|
return err; |
|
out_unregister_proto: |
|
unregister_pernet_subsys(&dccp_v6_ops); |
|
out_destroy_ctl_sock: |
|
inet6_unregister_protosw(&dccp_v6_protosw); |
|
proto_unregister(&dccp_v6_prot); |
|
goto out; |
|
} |
|
|
|
static void __exit dccp_v6_exit(void) |
|
{ |
|
inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP); |
|
unregister_pernet_subsys(&dccp_v6_ops); |
|
inet6_unregister_protosw(&dccp_v6_protosw); |
|
proto_unregister(&dccp_v6_prot); |
|
} |
|
|
|
module_init(dccp_v6_init); |
|
module_exit(dccp_v6_exit); |
|
|
|
/* |
|
* __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) |
|
* values directly, Also cover the case where the protocol is not specified, |
|
* i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP |
|
*/ |
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Arnaldo Carvalho de Melo <[email protected]>"); |
|
MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
|
|
|