1 #include "mctp-defines.h" 2 #include "base.h" 3 #include "container-of.h" 4 #include "libpldm/pldm.h" 5 #include "libpldm/transport.h" 6 #include "libpldm/transport/af-mctp.h" 7 #include "socket.h" 8 #include "transport.h" 9 10 #include <errno.h> 11 #include <limits.h> 12 #include <linux/mctp.h> 13 #include <poll.h> 14 #include <stdlib.h> 15 #include <string.h> 16 #include <sys/socket.h> 17 #include <sys/types.h> 18 #include <sys/un.h> 19 #include <unistd.h> 20 21 #define AF_MCTP_NAME "AF_MCTP" 22 struct pldm_transport_af_mctp { 23 struct pldm_transport transport; 24 int socket; 25 pldm_tid_t tid_eid_map[MCTP_MAX_NUM_EID]; 26 struct pldm_socket_sndbuf socket_send_buf; 27 }; 28 29 #define transport_to_af_mctp(ptr) \ 30 container_of(ptr, struct pldm_transport_af_mctp, transport) 31 32 LIBPLDM_ABI_TESTING 33 struct pldm_transport * 34 pldm_transport_af_mctp_core(struct pldm_transport_af_mctp *ctx) 35 { 36 return &ctx->transport; 37 } 38 39 LIBPLDM_ABI_TESTING 40 int pldm_transport_af_mctp_init_pollfd(struct pldm_transport *t, 41 struct pollfd *pollfd) 42 { 43 struct pldm_transport_af_mctp *ctx = transport_to_af_mctp(t); 44 pollfd->fd = ctx->socket; 45 pollfd->events = POLLIN; 46 return 0; 47 } 48 49 static int pldm_transport_af_mctp_get_eid(struct pldm_transport_af_mctp *ctx, 50 pldm_tid_t tid, mctp_eid_t *eid) 51 { 52 int i; 53 for (i = 0; i < MCTP_MAX_NUM_EID; i++) { 54 if (ctx->tid_eid_map[i] == tid) { 55 *eid = i; 56 return 0; 57 } 58 } 59 *eid = -1; 60 return -1; 61 } 62 63 LIBPLDM_ABI_TESTING 64 int pldm_transport_af_mctp_map_tid(struct pldm_transport_af_mctp *ctx, 65 pldm_tid_t tid, mctp_eid_t eid) 66 { 67 ctx->tid_eid_map[eid] = tid; 68 69 return 0; 70 } 71 72 LIBPLDM_ABI_TESTING 73 int pldm_transport_af_mctp_unmap_tid(struct pldm_transport_af_mctp *ctx, 74 __attribute__((unused)) pldm_tid_t tid, 75 mctp_eid_t eid) 76 { 77 ctx->tid_eid_map[eid] = 0; 78 79 return 0; 80 } 81 82 static pldm_requester_rc_t pldm_transport_af_mctp_recv(struct pldm_transport *t, 83 pldm_tid_t tid, 84 void **pldm_msg, 85 size_t *msg_len) 86 { 87 struct pldm_transport_af_mctp *af_mctp = transport_to_af_mctp(t); 88 mctp_eid_t eid = 0; 89 int rc = pldm_transport_af_mctp_get_eid(af_mctp, tid, &eid); 90 if (rc) { 91 return PLDM_REQUESTER_RECV_FAIL; 92 } 93 94 ssize_t length = recv(af_mctp->socket, NULL, 0, MSG_PEEK | MSG_TRUNC); 95 if (length <= 0) { 96 return PLDM_REQUESTER_RECV_FAIL; 97 } 98 *pldm_msg = malloc(length); 99 length = recv(af_mctp->socket, *pldm_msg, length, MSG_TRUNC); 100 if (length < (ssize_t)sizeof(struct pldm_msg_hdr)) { 101 free(*pldm_msg); 102 return PLDM_REQUESTER_INVALID_RECV_LEN; 103 } 104 *msg_len = length; 105 106 return PLDM_REQUESTER_SUCCESS; 107 } 108 109 static pldm_requester_rc_t pldm_transport_af_mctp_send(struct pldm_transport *t, 110 pldm_tid_t tid, 111 const void *pldm_msg, 112 size_t msg_len) 113 { 114 struct pldm_transport_af_mctp *af_mctp = transport_to_af_mctp(t); 115 mctp_eid_t eid = 0; 116 if (pldm_transport_af_mctp_get_eid(af_mctp, tid, &eid)) { 117 return PLDM_REQUESTER_SEND_FAIL; 118 } 119 120 struct sockaddr_mctp addr = { 0 }; 121 addr.smctp_family = AF_MCTP; 122 addr.smctp_addr.s_addr = eid; 123 addr.smctp_type = MCTP_MSG_TYPE_PLDM; 124 addr.smctp_tag = MCTP_TAG_OWNER; 125 126 if (msg_len > INT_MAX || 127 pldm_socket_sndbuf_accomodate(&(af_mctp->socket_send_buf), 128 (int)msg_len)) { 129 return PLDM_REQUESTER_SEND_FAIL; 130 } 131 132 ssize_t rc = sendto(af_mctp->socket, pldm_msg, msg_len, 0, 133 (struct sockaddr *)&addr, sizeof(addr)); 134 if (rc == -1) { 135 return PLDM_REQUESTER_SEND_FAIL; 136 } 137 return PLDM_REQUESTER_SUCCESS; 138 } 139 140 LIBPLDM_ABI_TESTING 141 int pldm_transport_af_mctp_init(struct pldm_transport_af_mctp **ctx) 142 { 143 if (!ctx || *ctx) { 144 return -EINVAL; 145 } 146 147 struct pldm_transport_af_mctp *af_mctp = 148 calloc(1, sizeof(struct pldm_transport_af_mctp)); 149 if (!af_mctp) { 150 return -ENOMEM; 151 } 152 153 af_mctp->transport.name = AF_MCTP_NAME; 154 af_mctp->transport.version = 1; 155 af_mctp->transport.recv = pldm_transport_af_mctp_recv; 156 af_mctp->transport.send = pldm_transport_af_mctp_send; 157 af_mctp->transport.init_pollfd = pldm_transport_af_mctp_init_pollfd; 158 af_mctp->socket = socket(AF_MCTP, SOCK_DGRAM, 0); 159 if (af_mctp->socket == -1) { 160 free(af_mctp); 161 return -1; 162 } 163 164 if (pldm_socket_sndbuf_init(&af_mctp->socket_send_buf, 165 af_mctp->socket)) { 166 close(af_mctp->socket); 167 free(af_mctp); 168 return -1; 169 } 170 171 *ctx = af_mctp; 172 return 0; 173 } 174 175 LIBPLDM_ABI_TESTING 176 void pldm_transport_af_mctp_destroy(struct pldm_transport_af_mctp *ctx) 177 { 178 if (!ctx) { 179 return; 180 } 181 close(ctx->socket); 182 free(ctx); 183 } 184