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788 lines
23 KiB
788 lines
23 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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* Shared Memory Communications over RDMA (SMC-R) and RoCE |
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* |
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* CLC (connection layer control) handshake over initial TCP socket to |
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* prepare for RDMA traffic |
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* |
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* Copyright IBM Corp. 2016, 2018 |
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* |
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* Author(s): Ursula Braun <[email protected]> |
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*/ |
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|
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#include <linux/in.h> |
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#include <linux/inetdevice.h> |
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#include <linux/if_ether.h> |
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#include <linux/sched/signal.h> |
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#include <linux/utsname.h> |
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#include <linux/ctype.h> |
|
|
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#include <net/addrconf.h> |
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#include <net/sock.h> |
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#include <net/tcp.h> |
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|
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#include "smc.h" |
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#include "smc_core.h" |
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#include "smc_clc.h" |
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#include "smc_ib.h" |
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#include "smc_ism.h" |
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|
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#define SMCR_CLC_ACCEPT_CONFIRM_LEN 68 |
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#define SMCD_CLC_ACCEPT_CONFIRM_LEN 48 |
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#define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78 |
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#define SMC_CLC_RECV_BUF_LEN 100 |
|
|
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/* eye catcher "SMCR" EBCDIC for CLC messages */ |
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static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; |
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/* eye catcher "SMCD" EBCDIC for CLC messages */ |
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static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'}; |
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|
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static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN]; |
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|
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/* check arriving CLC proposal */ |
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static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc) |
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{ |
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struct smc_clc_msg_proposal_prefix *pclc_prfx; |
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struct smc_clc_smcd_v2_extension *smcd_v2_ext; |
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struct smc_clc_msg_hdr *hdr = &pclc->hdr; |
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struct smc_clc_v2_extension *v2_ext; |
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|
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v2_ext = smc_get_clc_v2_ext(pclc); |
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pclc_prfx = smc_clc_proposal_get_prefix(pclc); |
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if (hdr->version == SMC_V1) { |
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if (hdr->typev1 == SMC_TYPE_N) |
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return false; |
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if (ntohs(hdr->length) != |
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sizeof(*pclc) + ntohs(pclc->iparea_offset) + |
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sizeof(*pclc_prfx) + |
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pclc_prfx->ipv6_prefixes_cnt * |
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sizeof(struct smc_clc_ipv6_prefix) + |
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sizeof(struct smc_clc_msg_trail)) |
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return false; |
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} else { |
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if (ntohs(hdr->length) != |
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sizeof(*pclc) + |
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sizeof(struct smc_clc_msg_smcd) + |
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(hdr->typev1 != SMC_TYPE_N ? |
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sizeof(*pclc_prfx) + |
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pclc_prfx->ipv6_prefixes_cnt * |
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sizeof(struct smc_clc_ipv6_prefix) : 0) + |
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(hdr->typev2 != SMC_TYPE_N ? |
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sizeof(*v2_ext) + |
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v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) + |
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(smcd_indicated(hdr->typev2) ? |
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sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt * |
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sizeof(struct smc_clc_smcd_gid_chid) : |
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0) + |
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sizeof(struct smc_clc_msg_trail)) |
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return false; |
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} |
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return true; |
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} |
|
|
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/* check arriving CLC accept or confirm */ |
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static bool |
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smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2) |
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{ |
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struct smc_clc_msg_hdr *hdr = &clc_v2->hdr; |
|
|
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if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D) |
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return false; |
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if (hdr->version == SMC_V1) { |
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if ((hdr->typev1 == SMC_TYPE_R && |
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ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) || |
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(hdr->typev1 == SMC_TYPE_D && |
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ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN)) |
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return false; |
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} else { |
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if (hdr->typev1 == SMC_TYPE_D && |
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ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 && |
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(ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 + |
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sizeof(struct smc_clc_first_contact_ext))) |
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return false; |
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} |
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return true; |
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} |
|
|
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static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len) |
|
{ |
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memset(fce, 0, sizeof(*fce)); |
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fce->os_type = SMC_CLC_OS_LINUX; |
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fce->release = SMC_RELEASE; |
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memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname)); |
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(*len) += sizeof(*fce); |
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} |
|
|
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/* check if received message has a correct header length and contains valid |
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* heading and trailing eyecatchers |
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*/ |
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static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl) |
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{ |
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struct smc_clc_msg_accept_confirm_v2 *clc_v2; |
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struct smc_clc_msg_proposal *pclc; |
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struct smc_clc_msg_decline *dclc; |
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struct smc_clc_msg_trail *trl; |
|
|
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if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && |
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memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) |
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return false; |
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switch (clcm->type) { |
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case SMC_CLC_PROPOSAL: |
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pclc = (struct smc_clc_msg_proposal *)clcm; |
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if (!smc_clc_msg_prop_valid(pclc)) |
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return false; |
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trl = (struct smc_clc_msg_trail *) |
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((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl)); |
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break; |
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case SMC_CLC_ACCEPT: |
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case SMC_CLC_CONFIRM: |
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clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm; |
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if (!smc_clc_msg_acc_conf_valid(clc_v2)) |
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return false; |
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trl = (struct smc_clc_msg_trail *) |
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((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) - |
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sizeof(*trl)); |
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break; |
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case SMC_CLC_DECLINE: |
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dclc = (struct smc_clc_msg_decline *)clcm; |
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if (ntohs(dclc->hdr.length) != sizeof(*dclc)) |
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return false; |
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trl = &dclc->trl; |
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break; |
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default: |
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return false; |
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} |
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if (check_trl && |
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memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && |
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memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) |
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return false; |
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return true; |
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} |
|
|
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/* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */ |
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static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4, |
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struct smc_clc_msg_proposal_prefix *prop) |
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{ |
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struct in_device *in_dev = __in_dev_get_rcu(dst->dev); |
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const struct in_ifaddr *ifa; |
|
|
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if (!in_dev) |
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return -ENODEV; |
|
|
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in_dev_for_each_ifa_rcu(ifa, in_dev) { |
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if (!inet_ifa_match(ipv4, ifa)) |
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continue; |
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prop->prefix_len = inet_mask_len(ifa->ifa_mask); |
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prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask; |
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/* prop->ipv6_prefixes_cnt = 0; already done by memset before */ |
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return 0; |
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} |
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return -ENOENT; |
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} |
|
|
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/* fill CLC proposal msg with ipv6 prefixes from device */ |
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static int smc_clc_prfx_set6_rcu(struct dst_entry *dst, |
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struct smc_clc_msg_proposal_prefix *prop, |
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struct smc_clc_ipv6_prefix *ipv6_prfx) |
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{ |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct inet6_dev *in6_dev = __in6_dev_get(dst->dev); |
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struct inet6_ifaddr *ifa; |
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int cnt = 0; |
|
|
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if (!in6_dev) |
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return -ENODEV; |
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/* use a maximum of 8 IPv6 prefixes from device */ |
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list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { |
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if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) |
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continue; |
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ipv6_addr_prefix(&ipv6_prfx[cnt].prefix, |
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&ifa->addr, ifa->prefix_len); |
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ipv6_prfx[cnt].prefix_len = ifa->prefix_len; |
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cnt++; |
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if (cnt == SMC_CLC_MAX_V6_PREFIX) |
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break; |
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} |
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prop->ipv6_prefixes_cnt = cnt; |
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if (cnt) |
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return 0; |
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#endif |
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return -ENOENT; |
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} |
|
|
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/* retrieve and set prefixes in CLC proposal msg */ |
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static int smc_clc_prfx_set(struct socket *clcsock, |
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struct smc_clc_msg_proposal_prefix *prop, |
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struct smc_clc_ipv6_prefix *ipv6_prfx) |
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{ |
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struct dst_entry *dst = sk_dst_get(clcsock->sk); |
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struct sockaddr_storage addrs; |
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struct sockaddr_in6 *addr6; |
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struct sockaddr_in *addr; |
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int rc = -ENOENT; |
|
|
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if (!dst) { |
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rc = -ENOTCONN; |
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goto out; |
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} |
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if (!dst->dev) { |
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rc = -ENODEV; |
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goto out_rel; |
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} |
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/* get address to which the internal TCP socket is bound */ |
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kernel_getsockname(clcsock, (struct sockaddr *)&addrs); |
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/* analyze IP specific data of net_device belonging to TCP socket */ |
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addr6 = (struct sockaddr_in6 *)&addrs; |
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rcu_read_lock(); |
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if (addrs.ss_family == PF_INET) { |
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/* IPv4 */ |
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addr = (struct sockaddr_in *)&addrs; |
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rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop); |
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} else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) { |
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/* mapped IPv4 address - peer is IPv4 only */ |
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rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3], |
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prop); |
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} else { |
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/* IPv6 */ |
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rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx); |
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} |
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rcu_read_unlock(); |
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out_rel: |
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dst_release(dst); |
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out: |
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return rc; |
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} |
|
|
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/* match ipv4 addrs of dev against addr in CLC proposal */ |
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static int smc_clc_prfx_match4_rcu(struct net_device *dev, |
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struct smc_clc_msg_proposal_prefix *prop) |
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{ |
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struct in_device *in_dev = __in_dev_get_rcu(dev); |
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const struct in_ifaddr *ifa; |
|
|
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if (!in_dev) |
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return -ENODEV; |
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in_dev_for_each_ifa_rcu(ifa, in_dev) { |
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if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && |
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inet_ifa_match(prop->outgoing_subnet, ifa)) |
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return 0; |
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} |
|
|
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return -ENOENT; |
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} |
|
|
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/* match ipv6 addrs of dev against addrs in CLC proposal */ |
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static int smc_clc_prfx_match6_rcu(struct net_device *dev, |
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struct smc_clc_msg_proposal_prefix *prop) |
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{ |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct inet6_dev *in6_dev = __in6_dev_get(dev); |
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struct smc_clc_ipv6_prefix *ipv6_prfx; |
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struct inet6_ifaddr *ifa; |
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int i, max; |
|
|
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if (!in6_dev) |
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return -ENODEV; |
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/* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */ |
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ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop)); |
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max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX); |
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list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { |
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if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) |
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continue; |
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for (i = 0; i < max; i++) { |
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if (ifa->prefix_len == ipv6_prfx[i].prefix_len && |
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ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix, |
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ifa->prefix_len)) |
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return 0; |
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} |
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} |
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#endif |
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return -ENOENT; |
|
} |
|
|
|
/* check if proposed prefixes match one of our device prefixes */ |
|
int smc_clc_prfx_match(struct socket *clcsock, |
|
struct smc_clc_msg_proposal_prefix *prop) |
|
{ |
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struct dst_entry *dst = sk_dst_get(clcsock->sk); |
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int rc; |
|
|
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if (!dst) { |
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rc = -ENOTCONN; |
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goto out; |
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} |
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if (!dst->dev) { |
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rc = -ENODEV; |
|
goto out_rel; |
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} |
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rcu_read_lock(); |
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if (!prop->ipv6_prefixes_cnt) |
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rc = smc_clc_prfx_match4_rcu(dst->dev, prop); |
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else |
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rc = smc_clc_prfx_match6_rcu(dst->dev, prop); |
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rcu_read_unlock(); |
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out_rel: |
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dst_release(dst); |
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out: |
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return rc; |
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} |
|
|
|
/* Wait for data on the tcp-socket, analyze received data |
|
* Returns: |
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* 0 if success and it was not a decline that we received. |
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* SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send. |
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* clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise. |
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*/ |
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int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, |
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u8 expected_type, unsigned long timeout) |
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{ |
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long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo; |
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struct sock *clc_sk = smc->clcsock->sk; |
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struct smc_clc_msg_hdr *clcm = buf; |
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struct msghdr msg = {NULL, 0}; |
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int reason_code = 0; |
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struct kvec vec = {buf, buflen}; |
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int len, datlen, recvlen; |
|
bool check_trl = true; |
|
int krflags; |
|
|
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/* peek the first few bytes to determine length of data to receive |
|
* so we don't consume any subsequent CLC message or payload data |
|
* in the TCP byte stream |
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*/ |
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/* |
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* Caller must make sure that buflen is no less than |
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* sizeof(struct smc_clc_msg_hdr) |
|
*/ |
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krflags = MSG_PEEK | MSG_WAITALL; |
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clc_sk->sk_rcvtimeo = timeout; |
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iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, |
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sizeof(struct smc_clc_msg_hdr)); |
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len = sock_recvmsg(smc->clcsock, &msg, krflags); |
|
if (signal_pending(current)) { |
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reason_code = -EINTR; |
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clc_sk->sk_err = EINTR; |
|
smc->sk.sk_err = EINTR; |
|
goto out; |
|
} |
|
if (clc_sk->sk_err) { |
|
reason_code = -clc_sk->sk_err; |
|
if (clc_sk->sk_err == EAGAIN && |
|
expected_type == SMC_CLC_DECLINE) |
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clc_sk->sk_err = 0; /* reset for fallback usage */ |
|
else |
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smc->sk.sk_err = clc_sk->sk_err; |
|
goto out; |
|
} |
|
if (!len) { /* peer has performed orderly shutdown */ |
|
smc->sk.sk_err = ECONNRESET; |
|
reason_code = -ECONNRESET; |
|
goto out; |
|
} |
|
if (len < 0) { |
|
if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE) |
|
smc->sk.sk_err = -len; |
|
reason_code = len; |
|
goto out; |
|
} |
|
datlen = ntohs(clcm->length); |
|
if ((len < sizeof(struct smc_clc_msg_hdr)) || |
|
(clcm->version < SMC_V1) || |
|
((clcm->type != SMC_CLC_DECLINE) && |
|
(clcm->type != expected_type))) { |
|
smc->sk.sk_err = EPROTO; |
|
reason_code = -EPROTO; |
|
goto out; |
|
} |
|
|
|
/* receive the complete CLC message */ |
|
memset(&msg, 0, sizeof(struct msghdr)); |
|
if (datlen > buflen) { |
|
check_trl = false; |
|
recvlen = buflen; |
|
} else { |
|
recvlen = datlen; |
|
} |
|
iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen); |
|
krflags = MSG_WAITALL; |
|
len = sock_recvmsg(smc->clcsock, &msg, krflags); |
|
if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) { |
|
smc->sk.sk_err = EPROTO; |
|
reason_code = -EPROTO; |
|
goto out; |
|
} |
|
datlen -= len; |
|
while (datlen) { |
|
u8 tmp[SMC_CLC_RECV_BUF_LEN]; |
|
|
|
vec.iov_base = &tmp; |
|
vec.iov_len = SMC_CLC_RECV_BUF_LEN; |
|
/* receive remaining proposal message */ |
|
recvlen = datlen > SMC_CLC_RECV_BUF_LEN ? |
|
SMC_CLC_RECV_BUF_LEN : datlen; |
|
iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen); |
|
len = sock_recvmsg(smc->clcsock, &msg, krflags); |
|
datlen -= len; |
|
} |
|
if (clcm->type == SMC_CLC_DECLINE) { |
|
struct smc_clc_msg_decline *dclc; |
|
|
|
dclc = (struct smc_clc_msg_decline *)clcm; |
|
reason_code = SMC_CLC_DECL_PEERDECL; |
|
smc->peer_diagnosis = ntohl(dclc->peer_diagnosis); |
|
if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 & |
|
SMC_FIRST_CONTACT_MASK) { |
|
smc->conn.lgr->sync_err = 1; |
|
smc_lgr_terminate_sched(smc->conn.lgr); |
|
} |
|
} |
|
|
|
out: |
|
clc_sk->sk_rcvtimeo = rcvtimeo; |
|
return reason_code; |
|
} |
|
|
|
/* send CLC DECLINE message across internal TCP socket */ |
|
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version) |
|
{ |
|
struct smc_clc_msg_decline dclc; |
|
struct msghdr msg; |
|
struct kvec vec; |
|
int len; |
|
|
|
memset(&dclc, 0, sizeof(dclc)); |
|
memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); |
|
dclc.hdr.type = SMC_CLC_DECLINE; |
|
dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline)); |
|
dclc.hdr.version = version; |
|
dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX; |
|
dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? |
|
SMC_FIRST_CONTACT_MASK : 0; |
|
if ((!smc->conn.lgr || !smc->conn.lgr->is_smcd) && |
|
smc_ib_is_valid_local_systemid()) |
|
memcpy(dclc.id_for_peer, local_systemid, |
|
sizeof(local_systemid)); |
|
dclc.peer_diagnosis = htonl(peer_diag_info); |
|
memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); |
|
|
|
memset(&msg, 0, sizeof(msg)); |
|
vec.iov_base = &dclc; |
|
vec.iov_len = sizeof(struct smc_clc_msg_decline); |
|
len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, |
|
sizeof(struct smc_clc_msg_decline)); |
|
if (len < 0 || len < sizeof(struct smc_clc_msg_decline)) |
|
len = -EPROTO; |
|
return len > 0 ? 0 : len; |
|
} |
|
|
|
/* send CLC PROPOSAL message across internal TCP socket */ |
|
int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini) |
|
{ |
|
struct smc_clc_smcd_v2_extension *smcd_v2_ext; |
|
struct smc_clc_msg_proposal_prefix *pclc_prfx; |
|
struct smc_clc_msg_proposal *pclc_base; |
|
struct smc_clc_smcd_gid_chid *gidchids; |
|
struct smc_clc_msg_proposal_area *pclc; |
|
struct smc_clc_ipv6_prefix *ipv6_prfx; |
|
struct smc_clc_v2_extension *v2_ext; |
|
struct smc_clc_msg_smcd *pclc_smcd; |
|
struct smc_clc_msg_trail *trl; |
|
int len, i, plen, rc; |
|
int reason_code = 0; |
|
struct kvec vec[8]; |
|
struct msghdr msg; |
|
|
|
pclc = kzalloc(sizeof(*pclc), GFP_KERNEL); |
|
if (!pclc) |
|
return -ENOMEM; |
|
|
|
pclc_base = &pclc->pclc_base; |
|
pclc_smcd = &pclc->pclc_smcd; |
|
pclc_prfx = &pclc->pclc_prfx; |
|
ipv6_prfx = pclc->pclc_prfx_ipv6; |
|
v2_ext = &pclc->pclc_v2_ext; |
|
smcd_v2_ext = &pclc->pclc_smcd_v2_ext; |
|
gidchids = pclc->pclc_gidchids; |
|
trl = &pclc->pclc_trl; |
|
|
|
pclc_base->hdr.version = SMC_V2; |
|
pclc_base->hdr.typev1 = ini->smc_type_v1; |
|
pclc_base->hdr.typev2 = ini->smc_type_v2; |
|
plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl); |
|
|
|
/* retrieve ip prefixes for CLC proposal msg */ |
|
if (ini->smc_type_v1 != SMC_TYPE_N) { |
|
rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx); |
|
if (rc) { |
|
if (ini->smc_type_v2 == SMC_TYPE_N) { |
|
kfree(pclc); |
|
return SMC_CLC_DECL_CNFERR; |
|
} |
|
pclc_base->hdr.typev1 = SMC_TYPE_N; |
|
} else { |
|
pclc_base->iparea_offset = htons(sizeof(*pclc_smcd)); |
|
plen += sizeof(*pclc_prfx) + |
|
pclc_prfx->ipv6_prefixes_cnt * |
|
sizeof(ipv6_prfx[0]); |
|
} |
|
} |
|
|
|
/* build SMC Proposal CLC message */ |
|
memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER, |
|
sizeof(SMC_EYECATCHER)); |
|
pclc_base->hdr.type = SMC_CLC_PROPOSAL; |
|
if (smcr_indicated(ini->smc_type_v1)) { |
|
/* add SMC-R specifics */ |
|
memcpy(pclc_base->lcl.id_for_peer, local_systemid, |
|
sizeof(local_systemid)); |
|
memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE); |
|
memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1], |
|
ETH_ALEN); |
|
} |
|
if (smcd_indicated(ini->smc_type_v1)) { |
|
/* add SMC-D specifics */ |
|
if (ini->ism_dev[0]) { |
|
pclc_smcd->ism.gid = htonll(ini->ism_dev[0]->local_gid); |
|
pclc_smcd->ism.chid = |
|
htons(smc_ism_get_chid(ini->ism_dev[0])); |
|
} |
|
} |
|
if (ini->smc_type_v2 == SMC_TYPE_N) { |
|
pclc_smcd->v2_ext_offset = 0; |
|
} else { |
|
u16 v2_ext_offset; |
|
u8 *eid = NULL; |
|
|
|
v2_ext_offset = sizeof(*pclc_smcd) - |
|
offsetofend(struct smc_clc_msg_smcd, v2_ext_offset); |
|
if (ini->smc_type_v1 != SMC_TYPE_N) |
|
v2_ext_offset += sizeof(*pclc_prfx) + |
|
pclc_prfx->ipv6_prefixes_cnt * |
|
sizeof(ipv6_prfx[0]); |
|
pclc_smcd->v2_ext_offset = htons(v2_ext_offset); |
|
v2_ext->hdr.eid_cnt = 0; |
|
v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt; |
|
v2_ext->hdr.flag.release = SMC_RELEASE; |
|
v2_ext->hdr.flag.seid = 1; |
|
v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) - |
|
offsetofend(struct smc_clnt_opts_area_hdr, |
|
smcd_v2_ext_offset) + |
|
v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); |
|
if (ini->ism_dev[0]) |
|
smc_ism_get_system_eid(ini->ism_dev[0], &eid); |
|
else |
|
smc_ism_get_system_eid(ini->ism_dev[1], &eid); |
|
if (eid) |
|
memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN); |
|
plen += sizeof(*v2_ext) + sizeof(*smcd_v2_ext); |
|
if (ini->ism_offered_cnt) { |
|
for (i = 1; i <= ini->ism_offered_cnt; i++) { |
|
gidchids[i - 1].gid = |
|
htonll(ini->ism_dev[i]->local_gid); |
|
gidchids[i - 1].chid = |
|
htons(smc_ism_get_chid(ini->ism_dev[i])); |
|
} |
|
plen += ini->ism_offered_cnt * |
|
sizeof(struct smc_clc_smcd_gid_chid); |
|
} |
|
} |
|
pclc_base->hdr.length = htons(plen); |
|
memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); |
|
|
|
/* send SMC Proposal CLC message */ |
|
memset(&msg, 0, sizeof(msg)); |
|
i = 0; |
|
vec[i].iov_base = pclc_base; |
|
vec[i++].iov_len = sizeof(*pclc_base); |
|
vec[i].iov_base = pclc_smcd; |
|
vec[i++].iov_len = sizeof(*pclc_smcd); |
|
if (ini->smc_type_v1 != SMC_TYPE_N) { |
|
vec[i].iov_base = pclc_prfx; |
|
vec[i++].iov_len = sizeof(*pclc_prfx); |
|
if (pclc_prfx->ipv6_prefixes_cnt > 0) { |
|
vec[i].iov_base = ipv6_prfx; |
|
vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt * |
|
sizeof(ipv6_prfx[0]); |
|
} |
|
} |
|
if (ini->smc_type_v2 != SMC_TYPE_N) { |
|
vec[i].iov_base = v2_ext; |
|
vec[i++].iov_len = sizeof(*v2_ext); |
|
vec[i].iov_base = smcd_v2_ext; |
|
vec[i++].iov_len = sizeof(*smcd_v2_ext); |
|
if (ini->ism_offered_cnt) { |
|
vec[i].iov_base = gidchids; |
|
vec[i++].iov_len = ini->ism_offered_cnt * |
|
sizeof(struct smc_clc_smcd_gid_chid); |
|
} |
|
} |
|
vec[i].iov_base = trl; |
|
vec[i++].iov_len = sizeof(*trl); |
|
/* due to the few bytes needed for clc-handshake this cannot block */ |
|
len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen); |
|
if (len < 0) { |
|
smc->sk.sk_err = smc->clcsock->sk->sk_err; |
|
reason_code = -smc->sk.sk_err; |
|
} else if (len < ntohs(pclc_base->hdr.length)) { |
|
reason_code = -ENETUNREACH; |
|
smc->sk.sk_err = -reason_code; |
|
} |
|
|
|
kfree(pclc); |
|
return reason_code; |
|
} |
|
|
|
/* build and send CLC CONFIRM / ACCEPT message */ |
|
static int smc_clc_send_confirm_accept(struct smc_sock *smc, |
|
struct smc_clc_msg_accept_confirm_v2 *clc_v2, |
|
int first_contact, u8 version) |
|
{ |
|
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[3]; |
|
struct msghdr msg; |
|
int i, len; |
|
|
|
/* send SMC Confirm CLC msg */ |
|
clc = (struct smc_clc_msg_accept_confirm *)clc_v2; |
|
clc->hdr.version = version; /* SMC version */ |
|
if (first_contact) |
|
clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK; |
|
if (conn->lgr->is_smcd) { |
|
/* SMC-D specific settings */ |
|
memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER, |
|
sizeof(SMCD_EYECATCHER)); |
|
clc->hdr.typev1 = SMC_TYPE_D; |
|
clc->d0.gid = conn->lgr->smcd->local_gid; |
|
clc->d0.token = conn->rmb_desc->token; |
|
clc->d0.dmbe_size = conn->rmbe_size_short; |
|
clc->d0.dmbe_idx = 0; |
|
memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); |
|
if (version == SMC_V1) { |
|
clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); |
|
} else { |
|
u8 *eid = NULL; |
|
|
|
clc_v2->chid = htons(smc_ism_get_chid(conn->lgr->smcd)); |
|
smc_ism_get_system_eid(conn->lgr->smcd, &eid); |
|
if (eid) |
|
memcpy(clc_v2->eid, eid, SMC_MAX_EID_LEN); |
|
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)); |
|
} else { |
|
struct smc_link *link = conn->lnk; |
|
|
|
/* SMC-R specific settings */ |
|
link = conn->lnk; |
|
memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER, |
|
sizeof(SMC_EYECATCHER)); |
|
clc->hdr.typev1 = SMC_TYPE_R; |
|
clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); |
|
memcpy(clc->r0.lcl.id_for_peer, local_systemid, |
|
sizeof(local_systemid)); |
|
memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE); |
|
memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1], |
|
ETH_ALEN); |
|
hton24(clc->r0.qpn, link->roce_qp->qp_num); |
|
clc->r0.rmb_rkey = |
|
htonl(conn->rmb_desc->mr_rx[link->link_idx]->rkey); |
|
clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */ |
|
clc->r0.rmbe_alert_token = htonl(conn->alert_token_local); |
|
switch (clc->hdr.type) { |
|
case SMC_CLC_ACCEPT: |
|
clc->r0.qp_mtu = link->path_mtu; |
|
break; |
|
case SMC_CLC_CONFIRM: |
|
clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu); |
|
break; |
|
} |
|
clc->r0.rmbe_size = conn->rmbe_size_short; |
|
clc->r0.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address |
|
(conn->rmb_desc->sgt[link->link_idx].sgl)); |
|
hton24(clc->r0.psn, link->psn_initial); |
|
memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); |
|
} |
|
|
|
memset(&msg, 0, sizeof(msg)); |
|
i = 0; |
|
vec[i].iov_base = clc_v2; |
|
if (version > SMC_V1) |
|
vec[i++].iov_len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 - sizeof(trl); |
|
else |
|
vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? |
|
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, |
|
ntohs(clc->hdr.length)); |
|
} |
|
|
|
/* send CLC CONFIRM message across internal TCP socket */ |
|
int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact, |
|
u8 version) |
|
{ |
|
struct smc_clc_msg_accept_confirm_v2 cclc_v2; |
|
int reason_code = 0; |
|
int len; |
|
|
|
/* send SMC Confirm CLC msg */ |
|
memset(&cclc_v2, 0, sizeof(cclc_v2)); |
|
cclc_v2.hdr.type = SMC_CLC_CONFIRM; |
|
len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact, |
|
version); |
|
if (len < ntohs(cclc_v2.hdr.length)) { |
|
if (len >= 0) { |
|
reason_code = -ENETUNREACH; |
|
smc->sk.sk_err = -reason_code; |
|
} else { |
|
smc->sk.sk_err = smc->clcsock->sk->sk_err; |
|
reason_code = -smc->sk.sk_err; |
|
} |
|
} |
|
return reason_code; |
|
} |
|
|
|
/* send CLC ACCEPT message across internal TCP socket */ |
|
int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact, |
|
u8 version) |
|
{ |
|
struct smc_clc_msg_accept_confirm_v2 aclc_v2; |
|
int len; |
|
|
|
memset(&aclc_v2, 0, sizeof(aclc_v2)); |
|
aclc_v2.hdr.type = SMC_CLC_ACCEPT; |
|
len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact, |
|
version); |
|
if (len < ntohs(aclc_v2.hdr.length)) |
|
len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; |
|
|
|
return len > 0 ? 0 : len; |
|
} |
|
|
|
void smc_clc_get_hostname(u8 **host) |
|
{ |
|
*host = &smc_hostname[0]; |
|
} |
|
|
|
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))); |
|
}
|
|
|