Commit 1f45f78f authored by Marcelo Ricardo Leitner's avatar Marcelo Ricardo Leitner Committed by David S. Miller
Browse files

sctp: allow GSO frags to access the chunk too 



SCTP will try to access original IP headers on sctp_recvmsg in order to
copy the addresses used. There are also other places that do similar access
to IP or even SCTP headers. But after 90017acc ("sctp: Add GSO
support") they aren't always there because they are only present in the
header skb.

SCTP handles the queueing of incoming data by cloning the incoming skb
and limiting to only the relevant payload. This clone has its cb updated
to something different and it's then queued on socket rx queue. Thus we
need to fix this in two moments.

For rx path, not related to socket queue yet, this patch uses a
partially copied sctp_input_cb to such GSO frags. This restores the
ability to access the headers for this part of the code.

Regarding the socket rx queue, it removes iif member from sctp_event and
also add a chunk pointer on it.

With these changes we're always able to reach the headers again.

The biggest change here is that now the sctp_chunk struct and the
original skb are only freed after the application consumed the buffer.
Note however that the original payload was already like this due to the
skb cloning.

For iif, SCTP's IPv4 code doesn't use it, so no change is necessary.
IPv6 now can fetch it directly from original's IPv6 CB as the original
skb is still accessible.

In the future we probably can simplify sctp_v*_skb_iif() stuff, as
sctp_v4_skb_iif() was called but it's return value not used, and now
it's not even called, but such cleanup is out of scope for this change.

Fixes: 90017acc ("sctp: Add GSO support")
Signed-off-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f5d258e6

include/net/sctp/structs.h

+7 −0
Original line number Diff line number Diff line
@@ -1107,6 +1107,13 @@ struct sctp_input_cb { 
};

#define SCTP_INPUT_CB(__skb)	((struct sctp_input_cb *)&((__skb)->cb[0]))



static inline const struct sk_buff *sctp_gso_headskb(const struct sk_buff *skb)

{

	const struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;



	return chunk->head_skb ? : skb;

}



/* These bind address data fields common between endpoints and associations */

struct sctp_bind_addr {

include/net/sctp/ulpevent.h

+1 −1
Original line number Diff line number Diff line
@@ -48,11 +48,11 @@ 
 */

struct sctp_ulpevent {

	struct sctp_association *asoc;

	struct sctp_chunk *chunk;

	unsigned int rmem_len;

	__u32 ppid;

	__u32 tsn;

	__u32 cumtsn;

	int iif;

	__u16 stream;

	__u16 ssn;

	__u16 flags;

net/sctp/inqueue.c

+7 −0
Original line number Diff line number Diff line
@@ -218,6 +218,13 @@ new_skb: 
		chunk->has_asconf = 0;

		chunk->end_of_packet = 0;

		chunk->ecn_ce_done = 0;

		if (chunk->head_skb) {

			struct sctp_input_cb

				*cb = SCTP_INPUT_CB(chunk->skb),

				*head_cb = SCTP_INPUT_CB(chunk->head_skb);



			cb->chunk = head_cb->chunk;

		}

	}



	chunk->chunk_hdr = ch;

net/sctp/ipv6.c

+4 −5
Original line number Diff line number Diff line
@@ -420,6 +420,7 @@ static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb, 
	addr->v6.sin6_flowinfo = 0; /* FIXME */

	addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;



	/* Always called on head skb, so this is safe */

	sh = sctp_hdr(skb);

	if (is_saddr) {

		*port  = sh->source;
@@ -710,8 +711,7 @@ static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) 
/* Where did this skb come from?  */

static int sctp_v6_skb_iif(const struct sk_buff *skb)

{

	struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;

	return opt->iif;

	return IP6CB(skb)->iif;

}



/* Was this packet marked by Explicit Congestion Notification? */
@@ -787,8 +787,7 @@ static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, 
		addr->v6.sin6_port = sh->source;

		addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;

		if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {

			struct sctp_ulpevent *ev = sctp_skb2event(skb);

			addr->v6.sin6_scope_id = ev->iif;

			addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);

		}

	}

net/sctp/protocol.c

+1 −0
Original line number Diff line number Diff line
@@ -240,6 +240,7 @@ static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 
	port = &addr->v4.sin_port;

	addr->v4.sin_family = AF_INET;



	/* Always called on head skb, so this is safe */

	sh = sctp_hdr(skb);

	if (is_saddr) {

		*port  = sh->source;

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