xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

smc: support variable CLC proposal messages

Browse Source 
According to RFC7609 [1] the CLC proposal message contains an area of
unknown length for future growth. Additionally it may contain up to
8 IPv6 prefixes. The current version of the SMC-code does not
understand CLC proposal messages using these variable length fields and,
thus, is incompatible with SMC implementations in other operating
systems.

This patch makes sure, SMC understands incoming CLC proposals
* with arbitrary length values for future growth
* with up to 8 IPv6 prefixes

[1] SMC-R Informational RFC: http://www.rfc-editor.org/info/rfc7609

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Hans Wippel <hwippel@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
2017-12-07 13:38:49 +01:00
committed by David S. Miller
parent 6b5771aa3c
commit e7b7a64a84
3 changed files with 107 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
net/smc/af_smc.c
View File

@@ -751,14 +751,16 @@ static void smc_listen_work(struct work_struct *work)
{
struct smc_sock *new_smc = container_of(work, struct smc_sock,
smc_listen_work);
struct smc_clc_msg_proposal_prefix *pclc_prfx;
struct socket *newclcsock = new_smc->clcsock;
struct smc_sock *lsmc = new_smc->listen_smc;
struct smc_clc_msg_accept_confirm cclc;
int local_contact = SMC_REUSE_CONTACT;
struct sock *newsmcsk = &new_smc->sk;
struct smc_clc_msg_proposal pclc;
struct smc_clc_msg_proposal *pclc;
struct smc_ib_device *smcibdev;
struct sockaddr_in peeraddr;
u8 buf[SMC_CLC_MAX_LEN];
struct smc_link *link;
int reason_code = 0;
int rc = 0, len;
@@ -775,7 +777,7 @@ static void smc_listen_work(struct work_struct *work)
/* do inband token exchange -
*wait for and receive SMC Proposal CLC message
*/
reason_code = smc_clc_wait_msg(new_smc, &pclc, sizeof(pclc),
reason_code = smc_clc_wait_msg(new_smc, &buf, sizeof(buf),
SMC_CLC_PROPOSAL);
if (reason_code < 0)
goto out_err;
@@ -804,8 +806,11 @@ static void smc_listen_work(struct work_struct *work)
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
goto decline_rdma;
}
if ((pclc.outgoing_subnet != subnet) ||
(pclc.prefix_len != prefix_len)) {
pclc = (struct smc_clc_msg_proposal *)&buf;
pclc_prfx = smc_clc_proposal_get_prefix(pclc);
if (pclc_prfx->outgoing_subnet != subnet ||
pclc_prfx->prefix_len != prefix_len) {
reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
goto decline_rdma;
}
@@ -816,7 +821,7 @@ static void smc_listen_work(struct work_struct *work)
/* allocate connection / link group */
mutex_lock(&smc_create_lgr_pending);
local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr,
smcibdev, ibport, &pclc.lcl, 0);
smcibdev, ibport, &pclc->lcl, 0);
if (local_contact < 0) {
rc = local_contact;
if (rc == -ENOMEM)