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

net/smc: introduce CLC first contact extension

Browse Source 
SMC Version 2 defines a first contact extension for CLC accept
and CLC confirm. This patch covers sending and receiving of the
CLC first contact extension.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
2020-09-26 12:44:31 +02:00
committed by David S. Miller
parent a7c9c5f4af
commit b81a5eb789
6 changed files with 91 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
net/smc/smc_clc.c
View File

@@ -14,6 +14,8 @@
#include <linux/inetdevice.h>
#include <linux/if_ether.h>
#include <linux/sched/signal.h>
#include <linux/utsname.h>
#include <linux/ctype.h>
#include <net/addrconf.h>
#include <net/sock.h>
@@ -35,6 +37,8 @@ static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
/* eye catcher "SMCD" EBCDIC for CLC messages */
static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN];
/* check arriving CLC proposal */
static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
{
@@ -92,12 +96,23 @@ smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2)
return false;
} else {
if (hdr->typev1 == SMC_TYPE_D &&
ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2)
ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 &&
(ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 +
sizeof(struct smc_clc_first_contact_ext)))
return false;
}
return true;
}
static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len)
{
memset(fce, 0, sizeof(*fce));
fce->os_type = SMC_CLC_OS_LINUX;
fce->release = SMC_RELEASE;
memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname));
(*len) += sizeof(*fce);
}
/* check if received message has a correct header length and contains valid
* heading and trailing eyecatchers
*/
@@ -623,10 +638,11 @@ static int smc_clc_send_confirm_accept(struct smc_sock *smc,
{
struct smc_connection *conn = &smc->conn;
struct smc_clc_msg_accept_confirm *clc;
struct smc_clc_first_contact_ext fce;
struct smc_clc_msg_trail trl;
struct kvec vec[2];
struct kvec vec[3];
struct msghdr msg;
int i;
int i, len;
/* send SMC Confirm CLC msg */
clc = (struct smc_clc_msg_accept_confirm *)clc_v2;
@@ -652,8 +668,10 @@ static int smc_clc_send_confirm_accept(struct smc_sock *smc,
smc_ism_get_system_eid(conn->lgr->smcd, &eid);
if (eid)
memcpy(clc_v2->eid, eid, SMC_MAX_EID_LEN);
clc_v2->hdr.length =
htons(SMCD_CLC_ACCEPT_CONFIRM_LEN_V2);
len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2;
if (first_contact)
smc_clc_fill_fce(&fce, &len);
clc_v2->hdr.length = htons(len);
}
memcpy(trl.eyecatcher, SMCD_EYECATCHER,
sizeof(SMCD_EYECATCHER));
@@ -701,6 +719,10 @@ static int smc_clc_send_confirm_accept(struct smc_sock *smc,
SMCD_CLC_ACCEPT_CONFIRM_LEN :
SMCR_CLC_ACCEPT_CONFIRM_LEN) -
sizeof(trl);
if (version > SMC_V1 && first_contact) {
vec[i].iov_base = &fce;
vec[i++].iov_len = sizeof(fce);
}
vec[i].iov_base = &trl;
vec[i++].iov_len = sizeof(trl);
return kernel_sendmsg(smc->clcsock, &msg, vec, 1,
@@ -748,3 +770,13 @@ int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact,
return len > 0 ? 0 : len;
}
void __init smc_clc_init(void)
{
struct new_utsname *u;
memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */
u = utsname();
memcpy(smc_hostname, u->nodename,
min_t(size_t, strlen(u->nodename), sizeof(smc_hostname)));
}