sctp: add sctp_make_op_error_limited and reuse inner functions
The idea is quite similar to the old functions, but note that the _fixed function wasn't "fixed" as in that it would generate a packet with a fixed size, but rather limited/bounded to PMTU. Also, now with sctp_mtu_payload(), we have a more accurate limit. Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner
David S. Miller
Родитель
6d3e8aa876
Коммит
8914f4bace
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@ -81,8 +81,6 @@ static int sctp_process_param(struct sctp_association *asoc,
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gfp_t gfp);
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static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
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const void *data);
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static void *sctp_addto_chunk_fixed(struct sctp_chunk *, int len,
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const void *data);
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/* Control chunk destructor */
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static void sctp_control_release_owner(struct sk_buff *skb)
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@ -154,9 +152,8 @@ static const struct sctp_paramhdr prsctp_param = {
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cpu_to_be16(sizeof(struct sctp_paramhdr)),
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};
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/* A helper to initialize an op error inside a
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* provided chunk, as most cause codes will be embedded inside an
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* abort chunk.
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/* A helper to initialize an op error inside a provided chunk, as most
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* cause codes will be embedded inside an abort chunk.
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*/
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int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
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size_t paylen)
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@ -177,29 +174,6 @@ int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
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return 0;
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}
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/* A helper to initialize an op error inside a
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* provided chunk, as most cause codes will be embedded inside an
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* abort chunk. Differs from sctp_init_cause in that it won't oops
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* if there isn't enough space in the op error chunk
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*/
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static int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
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size_t paylen)
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{
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struct sctp_errhdr err;
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__u16 len;
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/* Cause code constants are now defined in network order. */
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err.cause = cause_code;
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len = sizeof(err) + paylen;
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err.length = htons(len);
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if (skb_tailroom(chunk->skb) < len)
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return -ENOSPC;
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chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, sizeof(err), &err);
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return 0;
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}
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/* 3.3.2 Initiation (INIT) (1)
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*
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* This chunk is used to initiate a SCTP association between two
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@ -1263,20 +1237,26 @@ nodata:
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return retval;
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}
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/* Create an Operation Error chunk of a fixed size,
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* specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
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* This is a helper function to allocate an error chunk for
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* for those invalid parameter codes in which we may not want
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* to report all the errors, if the incoming chunk is large
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/* Create an Operation Error chunk of a fixed size, specifically,
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* min(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT) - overheads.
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* This is a helper function to allocate an error chunk for for those
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* invalid parameter codes in which we may not want to report all the
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* errors, if the incoming chunk is large. If it can't fit in a single
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* packet, we ignore it.
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*/
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static inline struct sctp_chunk *sctp_make_op_error_fixed(
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static inline struct sctp_chunk *sctp_make_op_error_limited(
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const struct sctp_association *asoc,
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const struct sctp_chunk *chunk)
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{
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size_t size = asoc ? asoc->pathmtu : 0;
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size_t size = SCTP_DEFAULT_MAXSEGMENT;
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struct sctp_sock *sp = NULL;
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if (!size)
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size = SCTP_DEFAULT_MAXSEGMENT;
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if (asoc) {
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size = min_t(size_t, size, asoc->pathmtu);
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sp = sctp_sk(asoc->base.sk);
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}
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size = sctp_mtu_payload(sp, size, sizeof(struct sctp_errhdr));
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return sctp_make_op_error_space(asoc, chunk, size);
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}
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@ -1528,18 +1508,6 @@ void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
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return target;
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}
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/* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
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* space in the chunk
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*/
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static void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
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int len, const void *data)
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{
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if (skb_tailroom(chunk->skb) >= len)
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return sctp_addto_chunk(chunk, len, data);
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else
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return NULL;
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}
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/* Append bytes from user space to the end of a chunk. Will panic if
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* chunk is not big enough.
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* Returns a kernel err value.
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@ -1834,6 +1802,9 @@ no_hmac:
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kt = ktime_get_real();
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if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
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suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
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__be32 n = htonl(usecs);
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/*
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* Section 3.3.10.3 Stale Cookie Error (3)
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*
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@ -1842,17 +1813,12 @@ no_hmac:
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* Stale Cookie Error: Indicates the receipt of a valid State
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* Cookie that has expired.
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*/
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len = ntohs(chunk->chunk_hdr->length);
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*errp = sctp_make_op_error_space(asoc, chunk, len);
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if (*errp) {
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suseconds_t usecs = ktime_to_us(ktime_sub(kt, bear_cookie->expiration));
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__be32 n = htonl(usecs);
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sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
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sizeof(n));
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sctp_addto_chunk(*errp, sizeof(n), &n);
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*errp = sctp_make_op_error(asoc, chunk,
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SCTP_ERROR_STALE_COOKIE, &n,
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sizeof(n), 0);
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if (*errp)
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*error = -SCTP_IERROR_STALE_COOKIE;
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} else
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else
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*error = -SCTP_IERROR_NOMEM;
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goto fail;
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@ -2003,12 +1969,8 @@ static int sctp_process_hn_param(const struct sctp_association *asoc,
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if (*errp)
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sctp_chunk_free(*errp);
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*errp = sctp_make_op_error_space(asoc, chunk, len);
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if (*errp) {
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sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
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sctp_addto_chunk(*errp, len, param.v);
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}
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*errp = sctp_make_op_error(asoc, chunk, SCTP_ERROR_DNS_FAILED,
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param.v, len, 0);
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/* Stop processing this chunk. */
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return 0;
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@ -2133,23 +2095,23 @@ static enum sctp_ierror sctp_process_unk_param(
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/* Make an ERROR chunk, preparing enough room for
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* returning multiple unknown parameters.
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*/
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if (NULL == *errp)
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*errp = sctp_make_op_error_fixed(asoc, chunk);
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if (*errp) {
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if (!sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
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SCTP_PAD4(ntohs(param.p->length))))
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sctp_addto_chunk_fixed(*errp,
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SCTP_PAD4(ntohs(param.p->length)),
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param.v);
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} else {
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/* If there is no memory for generating the ERROR
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* report as specified, an ABORT will be triggered
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* to the peer and the association won't be
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* established.
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*/
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retval = SCTP_IERROR_NOMEM;
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if (!*errp) {
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*errp = sctp_make_op_error_limited(asoc, chunk);
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if (!*errp) {
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/* If there is no memory for generating the
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* ERROR report as specified, an ABORT will be
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* triggered to the peer and the association
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* won't be established.
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*/
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retval = SCTP_IERROR_NOMEM;
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break;
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}
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}
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if (!sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
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ntohs(param.p->length)))
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sctp_addto_chunk(*errp, ntohs(param.p->length),
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param.v);
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break;
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default:
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break;
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@ -2225,10 +2187,10 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
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* MUST be aborted. The ABORT chunk SHOULD contain the error
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* cause 'Protocol Violation'.
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*/
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if (SCTP_AUTH_RANDOM_LENGTH !=
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ntohs(param.p->length) - sizeof(struct sctp_paramhdr)) {
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if (SCTP_AUTH_RANDOM_LENGTH != ntohs(param.p->length) -
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sizeof(struct sctp_paramhdr)) {
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sctp_process_inv_paramlength(asoc, param.p,
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chunk, err_chunk);
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chunk, err_chunk);
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retval = SCTP_IERROR_ABORT;
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}
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break;
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