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Fix the ICMP6 handling for SCTP.

Browse Source 
Keep the IPv4 code in sync.

MFC after:	1 week
This commit is contained in:
Michael Tuexen 2016-04-16 21:34:49 +00:00
parent a13bfb0908
commit b9dd6a90b6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=298132
4 changed files with 189 additions and 226 deletions
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48
sys/netinet/sctp_usrreq.c
View File

@ -143,7 +143,7 @@ sctp_pathmtu_adjustment(struct sctp_tcb *stcb, uint16_t nxtsz)
}
#ifdef INET
static void
void
sctp_notify(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_nets *net,
@ -171,13 +171,7 @@ sctp_notify(struct sctp_inpcb *inp,
(icmp_code == ICMP_UNREACH_NET_PROHIB) ||
(icmp_code == ICMP_UNREACH_HOST_PROHIB) ||
(icmp_code == ICMP_UNREACH_FILTER_PROHIB)) {
/*
* Hmm reachablity problems we must examine closely. If its
* not reachable, we may have lost a network. Or if there is
* NO protocol at the other end named SCTP. well we consider
* it a OOTB abort.
*/
/* Mark the net unreachable. */
if (net->dest_state & SCTP_ADDR_REACHABLE) {
/* OK, that destination is NOT reachable. */
net->dest_state &= ~SCTP_ADDR_REACHABLE;
@ -189,13 +183,7 @@ sctp_notify(struct sctp_inpcb *inp,
SCTP_TCB_UNLOCK(stcb);
} else if ((icmp_code == ICMP_UNREACH_PROTOCOL) ||
(icmp_code == ICMP_UNREACH_PORT)) {
/*
* Here the peer is either playing tricks on us, including
* an address that belongs to someone who does not support
* SCTP OR was a userland implementation that shutdown and
* now is dead. In either case treat it like a OOTB abort
* with no TCB
*/
/* Treat it like an ABORT. */
sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
so = SCTP_INP_SO(inp);
@ -261,7 +249,7 @@ sctp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
struct sctp_tcb *stcb;
struct sctp_nets *net;
struct sctp_init_chunk *ch;
struct sockaddr_in to, from;
struct sockaddr_in src, dst;
if (sa->sa_family != AF_INET ||
((struct sockaddr_in *)sa)->sin_addr.s_addr == INADDR_ANY) {
@ -278,23 +266,25 @@ sctp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
(sizeof(struct icmp) - sizeof(struct ip)));
outer_ip = (struct ip *)((caddr_t)icmp - sizeof(struct ip));
sh = (struct sctphdr *)((caddr_t)inner_ip + (inner_ip->ip_hl << 2));
bzero(&to, sizeof(to));
bzero(&from, sizeof(from));
from.sin_family = to.sin_family = AF_INET;
from.sin_len = to.sin_len = sizeof(to);
from.sin_port = sh->src_port;
from.sin_addr = inner_ip->ip_src;
to.sin_port = sh->dest_port;
to.sin_addr = inner_ip->ip_dst;
memset(&src, 0, sizeof(struct sockaddr_in));
src.sin_family = AF_INET;
src.sin_len = sizeof(struct sockaddr_in);
src.sin_port = sh->src_port;
src.sin_addr = inner_ip->ip_src;
memset(&dst, 0, sizeof(struct sockaddr_in));
dst.sin_family = AF_INET;
dst.sin_len = sizeof(struct sockaddr_in);
dst.sin_port = sh->dest_port;
dst.sin_addr = inner_ip->ip_dst;
/*
* 'to' holds the dest of the packet that failed to be sent.
* 'from' holds our local endpoint address. Thus we reverse
* the to and the from in the lookup.
* 'dst' holds the dest of the packet that failed to be
* sent. 'src' holds our local endpoint address. Thus we
* reverse the dst and the src in the lookup.
*/
inp = NULL;
net = NULL;
stcb = sctp_findassociation_addr_sa((struct sockaddr *)&to,
(struct sockaddr *)&from,
stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
(struct sockaddr *)&src,
&inp, &net, 1,
SCTP_DEFAULT_VRFID);
if ((stcb != NULL) &&

3
sys/netinet/sctp_var.h
View File

@ -341,6 +341,9 @@ int sctp_input(struct mbuf **, int *, int);
void sctp_pathmtu_adjustment(struct sctp_tcb *, uint16_t);
void sctp_drain(void);
void sctp_init(void);
void
sctp_notify(struct sctp_inpcb *, struct sctp_tcb *, struct sctp_nets *,
uint8_t, uint8_t, uint16_t, uint16_t);
void sctp_finish(void);
int sctp_flush(struct socket *, int);
int sctp_shutdown(struct socket *);

357
sys/netinet6/sctp6_usrreq.c
View File

@ -184,255 +184,226 @@ sctp6_input(struct mbuf **i_pak, int *offp, int proto SCTP_UNUSED)
return (sctp6_input_with_port(i_pak, offp, 0));
}
static void
sctp6_notify_mbuf(struct sctp_inpcb *inp, struct icmp6_hdr *icmp6,
struct sctphdr *sh, struct sctp_tcb *stcb, struct sctp_nets *net)
{
uint32_t nxtsz;
if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
(icmp6 == NULL) || (sh == NULL)) {
goto out;
}
/* First do we even look at it? */
if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag))
goto out;
if (icmp6->icmp6_type != ICMP6_PACKET_TOO_BIG) {
/* not PACKET TO BIG */
goto out;
}
/*
* ok we need to look closely. We could even get smarter and look at
* anyone that we sent to in case we get a different ICMP that tells
* us there is no way to reach a host, but for this impl, all we
* care about is MTU discovery.
*/
nxtsz = ntohl(icmp6->icmp6_mtu);
/* Stop any PMTU timer */
sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL,
SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_1);
/* Adjust destination size limit */
if (net->mtu > nxtsz) {
net->mtu = nxtsz;
if (net->port) {
net->mtu -= sizeof(struct udphdr);
}
}
/* now what about the ep? */
if (stcb->asoc.smallest_mtu > nxtsz) {
struct sctp_tmit_chunk *chk;
/* Adjust that too */
stcb->asoc.smallest_mtu = nxtsz;
/* now off to subtract IP_DF flag if needed */
TAILQ_FOREACH(chk, &stcb->asoc.send_queue, sctp_next) {
if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
}
}
TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
if ((uint32_t) (chk->send_size + IP_HDR_SIZE) > nxtsz) {
/*
* For this guy we also mark for immediate
* resend since we sent to big of chunk
*/
chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
if (chk->sent != SCTP_DATAGRAM_RESEND)
stcb->asoc.sent_queue_retran_cnt++;
chk->sent = SCTP_DATAGRAM_RESEND;
chk->rec.data.doing_fast_retransmit = 0;
chk->sent = SCTP_DATAGRAM_RESEND;
/* Clear any time so NO RTT is being done */
chk->sent_rcv_time.tv_sec = 0;
chk->sent_rcv_time.tv_usec = 0;
stcb->asoc.total_flight -= chk->send_size;
net->flight_size -= chk->send_size;
}
}
}
sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, NULL);
out:
if (stcb) {
SCTP_TCB_UNLOCK(stcb);
}
}
void
sctp6_notify(struct sctp_inpcb *inp,
struct icmp6_hdr *icmph,
struct sctphdr *sh,
struct sockaddr *to,
struct sctp_tcb *stcb,
struct sctp_nets *net)
struct sctp_nets *net,
uint8_t icmp6_type,
uint8_t icmp6_code,
uint16_t next_mtu)
{
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
struct socket *so;
#endif
int timer_stopped;
/* protection */
if ((inp == NULL) || (stcb == NULL) || (net == NULL) ||
(sh == NULL) || (to == NULL)) {
if (stcb)
SCTP_TCB_UNLOCK(stcb);
return;
}
/* First job is to verify the vtag matches what I would send */
if (ntohl(sh->v_tag) != (stcb->asoc.peer_vtag)) {
SCTP_TCB_UNLOCK(stcb);
return;
}
if (icmph->icmp6_type != ICMP_UNREACH) {
/* We only care about unreachable */
SCTP_TCB_UNLOCK(stcb);
return;
}
if ((icmph->icmp6_code == ICMP_UNREACH_NET) ||
(icmph->icmp6_code == ICMP_UNREACH_HOST) ||
(icmph->icmp6_code == ICMP_UNREACH_NET_UNKNOWN) ||
(icmph->icmp6_code == ICMP_UNREACH_HOST_UNKNOWN) ||
(icmph->icmp6_code == ICMP_UNREACH_ISOLATED) ||
(icmph->icmp6_code == ICMP_UNREACH_NET_PROHIB) ||
(icmph->icmp6_code == ICMP_UNREACH_HOST_PROHIB) ||
(icmph->icmp6_code == ICMP_UNREACH_FILTER_PROHIB)) {
/*
* Hmm reachablity problems we must examine closely. If its
* not reachable, we may have lost a network. Or if there is
* NO protocol at the other end named SCTP. well we consider
* it a OOTB abort.
*/
if (net->dest_state & SCTP_ADDR_REACHABLE) {
/* Ok that destination is NOT reachable */
net->dest_state &= ~SCTP_ADDR_REACHABLE;
net->dest_state &= ~SCTP_ADDR_PF;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
switch (icmp6_type) {
case ICMP6_DST_UNREACH:
if ((icmp6_code == ICMP6_DST_UNREACH_NOROUTE) ||
(icmp6_code == ICMP6_DST_UNREACH_ADMIN) ||
(icmp6_code == ICMP6_DST_UNREACH_BEYONDSCOPE) ||
(icmp6_code == ICMP6_DST_UNREACH_ADDR)) {
/* Mark the net unreachable. */
if (net->dest_state & SCTP_ADDR_REACHABLE) {
/* Ok that destination is not reachable */
net->dest_state &= ~SCTP_ADDR_REACHABLE;
net->dest_state &= ~SCTP_ADDR_PF;
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
stcb, 0, (void *)net, SCTP_SO_NOT_LOCKED);
}
}
SCTP_TCB_UNLOCK(stcb);
} else if ((icmph->icmp6_code == ICMP_UNREACH_PROTOCOL) ||
(icmph->icmp6_code == ICMP_UNREACH_PORT)) {
/*
* Here the peer is either playing tricks on us, including
* an address that belongs to someone who does not support
* SCTP OR was a userland implementation that shutdown and
* now is dead. In either case treat it like a OOTB abort
* with no TCB
*/
sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
break;
case ICMP6_PARAM_PROB:
/* Treat it like an ABORT. */
if (icmp6_code == ICMP6_PARAMPROB_NEXTHEADER) {
sctp_abort_notification(stcb, 1, 0, NULL, SCTP_SO_NOT_LOCKED);
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
so = SCTP_INP_SO(inp);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
so = SCTP_INP_SO(inp);
atomic_add_int(&stcb->asoc.refcnt, 1);
SCTP_TCB_UNLOCK(stcb);
SCTP_SOCKET_LOCK(so, 1);
SCTP_TCB_LOCK(stcb);
atomic_subtract_int(&stcb->asoc.refcnt, 1);
#endif
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP6_USRREQ + SCTP_LOC_2);
(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
SCTP_FROM_SCTP_USRREQ + SCTP_LOC_2);
#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
SCTP_SOCKET_UNLOCK(so, 1);
/* SCTP_TCB_UNLOCK(stcb); MT: I think this is not needed. */
SCTP_SOCKET_UNLOCK(so, 1);
#endif
/* no need to unlock here, since the TCB is gone */
} else {
} else {
SCTP_TCB_UNLOCK(stcb);
}
break;
case ICMP6_PACKET_TOO_BIG:
if (SCTP_OS_TIMER_PENDING(&net->pmtu_timer.timer)) {
timer_stopped = 1;
sctp_timer_stop(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net,
SCTP_FROM_SCTP_USRREQ + SCTP_LOC_1);
} else {
timer_stopped = 0;
}
break;
/* Update the path MTU. */
if (net->mtu > next_mtu) {
net->mtu = next_mtu;
if (net->port) {
net->mtu -= sizeof(struct udphdr);
}
}
/* Update the association MTU */
if (stcb->asoc.smallest_mtu > next_mtu) {
sctp_pathmtu_adjustment(stcb, next_mtu);
}
/* Finally, start the PMTU timer if it was running before. */
if (timer_stopped) {
sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
}
SCTP_TCB_UNLOCK(stcb);
break;
default:
SCTP_TCB_UNLOCK(stcb);
break;
}
}
void
sctp6_ctlinput(int cmd, struct sockaddr *pktdst, void *d)
{
struct ip6ctlparam *ip6cp;
struct sctp_inpcb *inp;
struct sctp_tcb *stcb;
struct sctp_nets *net;
struct sctphdr sh;
struct ip6ctlparam *ip6cp = NULL;
uint32_t vrf_id;
vrf_id = SCTP_DEFAULT_VRFID;
struct sockaddr_in6 src, dst;
if (pktdst->sa_family != AF_INET6 ||
pktdst->sa_len != sizeof(struct sockaddr_in6))
pktdst->sa_len != sizeof(struct sockaddr_in6)) {
return;
if ((unsigned)cmd >= PRC_NCMDS)
}
if ((unsigned)cmd >= PRC_NCMDS) {
return;
}
if (PRC_IS_REDIRECT(cmd)) {
d = NULL;
} else if (inet6ctlerrmap[cmd] == 0) {
return;
}
/* if the parameter is from icmp6, decode it. */
/* If the parameter is from icmp6, decode it. */
if (d != NULL) {
ip6cp = (struct ip6ctlparam *)d;
} else {
ip6cp = (struct ip6ctlparam *)NULL;
}
if (ip6cp) {
if (ip6cp != NULL) {
/*
* XXX: We assume that when IPV6 is non NULL, M and OFF are
* valid.
*/
struct sctp_inpcb *inp = NULL;
struct sctp_tcb *stcb = NULL;
struct sctp_nets *net = NULL;
struct sockaddr_in6 final;
if (ip6cp->ip6c_m == NULL)
if (ip6cp->ip6c_m == NULL) {
return;
/* Check if we can safely examine the SCTP header. */
if (ip6cp->ip6c_m->m_pkthdr.len < ip6cp->ip6c_off + sizeof(sh))
}
/*
* Check if we can safely examine the ports and the
* verification tag of the SCTP common header.
*/
if (ip6cp->ip6c_m->m_pkthdr.len <
ip6cp->ip6c_off + offsetof(struct sctphdr, checksum)) {
return;
}
/* Copy out the port numbers and the verification tag. */
bzero(&sh, sizeof(sh));
bzero(&final, sizeof(final));
m_copydata(ip6cp->ip6c_m,
ip6cp->ip6c_off,
sizeof(uint16_t) + sizeof(uint16_t) + sizeof(uint32_t),
(caddr_t)&sh);
memset(&src, 0, sizeof(struct sockaddr_in6));
src.sin6_family = AF_INET6;
src.sin6_len = sizeof(struct sockaddr_in6);
src.sin6_port = sh.src_port;
src.sin6_addr = ip6cp->ip6c_ip6->ip6_src;
if (in6_setscope(&src.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
return;
}
memset(&dst, 0, sizeof(struct sockaddr_in6));
dst.sin6_family = AF_INET6;
dst.sin6_len = sizeof(struct sockaddr_in6);
dst.sin6_port = sh.dest_port;
dst.sin6_addr = ip6cp->ip6c_ip6->ip6_dst;
if (in6_setscope(&dst.sin6_addr, ip6cp->ip6c_m->m_pkthdr.rcvif, NULL) != 0) {
return;
}
inp = NULL;
net = NULL;
m_copydata(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(sh),
(caddr_t)&sh);
ip6cp->ip6c_src->sin6_port = sh.src_port;
final.sin6_len = sizeof(final);
final.sin6_family = AF_INET6;
final.sin6_addr = ((struct sockaddr_in6 *)pktdst)->sin6_addr;
final.sin6_port = sh.dest_port;
stcb = sctp_findassociation_addr_sa((struct sockaddr *)&final,
(struct sockaddr *)ip6cp->ip6c_src,
&inp, &net, 1, vrf_id);
/* inp's ref-count increased && stcb locked */
if (stcb != NULL && inp && (inp->sctp_socket != NULL)) {
if (cmd == PRC_MSGSIZE) {
sctp6_notify_mbuf(inp,
ip6cp->ip6c_icmp6,
&sh,
stcb,
net);
/* inp's ref-count reduced && stcb unlocked */
stcb = sctp_findassociation_addr_sa((struct sockaddr *)&dst,
(struct sockaddr *)&src,
&inp, &net, 1, SCTP_DEFAULT_VRFID);
if ((stcb != NULL) &&
(net != NULL) &&
(inp != NULL) &&
(inp->sctp_socket != NULL)) {
/* Check the verification tag */
if (ntohl(sh.v_tag) != 0) {
/*
* This must be the verification tag used
* for sending out packets. We don't
* consider packets reflecting the
* verification tag.
*/
if (ntohl(sh.v_tag) != stcb->asoc.peer_vtag) {
SCTP_TCB_UNLOCK(stcb);
return;
}
} else {
sctp6_notify(inp, ip6cp->ip6c_icmp6, &sh,
(struct sockaddr *)&final,
stcb, net);
/* inp's ref-count reduced && stcb unlocked */
if (ip6cp->ip6c_m->m_pkthdr.len >=
ip6cp->ip6c_off + sizeof(struct sctphdr) +
sizeof(struct sctp_chunkhdr) +
offsetof(struct sctp_init, a_rwnd)) {
/*
* In this case we can check if we
* got an INIT chunk and if the
* initiate tag matches.
*/
uint32_t initiate_tag;
uint8_t chunk_type;
m_copydata(ip6cp->ip6c_m,
ip6cp->ip6c_off +
sizeof(struct sctphdr),
sizeof(uint8_t),
(caddr_t)&chunk_type);
m_copydata(ip6cp->ip6c_m,
ip6cp->ip6c_off +
sizeof(struct sctphdr) +
sizeof(struct sctp_chunkhdr),
sizeof(uint32_t),
(caddr_t)&initiate_tag);
if ((chunk_type != SCTP_INITIATION) ||
(ntohl(initiate_tag) != stcb->asoc.my_vtag)) {
SCTP_TCB_UNLOCK(stcb);
return;
}
} else {
SCTP_TCB_UNLOCK(stcb);
return;
}
}
sctp6_notify(inp, stcb, net,
ip6cp->ip6c_icmp6->icmp6_type,
ip6cp->ip6c_icmp6->icmp6_code,
(uint16_t) ntohl(ip6cp->ip6c_icmp6->icmp6_mtu));
} else {
if (PRC_IS_REDIRECT(cmd) && inp) {
in6_rtchange((struct in6pcb *)inp,
inet6ctlerrmap[cmd]);
}
if (inp) {
if ((stcb == NULL) && (inp != NULL)) {
/* reduce inp's ref-count */
SCTP_INP_WLOCK(inp);
SCTP_INP_DECR_REF(inp);
SCTP_INP_WUNLOCK(inp);
}
if (stcb)
if (stcb) {
SCTP_TCB_UNLOCK(stcb);
}
}
}
}

7
sys/netinet6/sctp6_var.h
View File

@ -47,10 +47,9 @@ int
sctp6_output(struct sctp_inpcb *, struct mbuf *, struct sockaddr *,
struct mbuf *, struct proc *);
void sctp6_ctlinput(int, struct sockaddr *, void *);
extern void
sctp6_notify(struct sctp_inpcb *, struct icmp6_hdr *,
struct sctphdr *, struct sockaddr *,
struct sctp_tcb *, struct sctp_nets *);
void
sctp6_notify(struct sctp_inpcb *, struct sctp_tcb *, struct sctp_nets *,
uint8_t, uint8_t, uint16_t);
#endif
#endif