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 ssize_t length; 90 int rc; 91 92 rc = pldm_transport_af_mctp_get_eid(af_mctp, tid, &eid); 93 if (rc) { 94 return PLDM_REQUESTER_RECV_FAIL; 95 } 96 97 length = recv(af_mctp->socket, NULL, 0, MSG_PEEK | MSG_TRUNC); 98 if (length <= 0) { 99 return PLDM_REQUESTER_RECV_FAIL; 100 } 101 102 *pldm_msg = malloc(length); 103 length = recv(af_mctp->socket, *pldm_msg, length, MSG_TRUNC); 104 if (length < (ssize_t)sizeof(struct pldm_msg_hdr)) { 105 free(*pldm_msg); 106 return PLDM_REQUESTER_INVALID_RECV_LEN; 107 } 108 109 *msg_len = length; 110 111 return PLDM_REQUESTER_SUCCESS; 112 } 113 114 static pldm_requester_rc_t pldm_transport_af_mctp_send(struct pldm_transport *t, 115 pldm_tid_t tid, 116 const void *pldm_msg, 117 size_t msg_len) 118 { 119 struct pldm_transport_af_mctp *af_mctp = transport_to_af_mctp(t); 120 mctp_eid_t eid = 0; 121 if (pldm_transport_af_mctp_get_eid(af_mctp, tid, &eid)) { 122 return PLDM_REQUESTER_SEND_FAIL; 123 } 124 125 struct sockaddr_mctp addr = { 0 }; 126 addr.smctp_family = AF_MCTP; 127 addr.smctp_addr.s_addr = eid; 128 addr.smctp_type = MCTP_MSG_TYPE_PLDM; 129 addr.smctp_tag = MCTP_TAG_OWNER; 130 131 if (msg_len > INT_MAX || 132 pldm_socket_sndbuf_accomodate(&(af_mctp->socket_send_buf), 133 (int)msg_len)) { 134 return PLDM_REQUESTER_SEND_FAIL; 135 } 136 137 ssize_t rc = sendto(af_mctp->socket, pldm_msg, msg_len, 0, 138 (struct sockaddr *)&addr, sizeof(addr)); 139 if (rc == -1) { 140 return PLDM_REQUESTER_SEND_FAIL; 141 } 142 return PLDM_REQUESTER_SUCCESS; 143 } 144 145 LIBPLDM_ABI_TESTING 146 int pldm_transport_af_mctp_init(struct pldm_transport_af_mctp **ctx) 147 { 148 if (!ctx || *ctx) { 149 return -EINVAL; 150 } 151 152 struct pldm_transport_af_mctp *af_mctp = 153 calloc(1, sizeof(struct pldm_transport_af_mctp)); 154 if (!af_mctp) { 155 return -ENOMEM; 156 } 157 158 af_mctp->transport.name = AF_MCTP_NAME; 159 af_mctp->transport.version = 1; 160 af_mctp->transport.recv = pldm_transport_af_mctp_recv; 161 af_mctp->transport.send = pldm_transport_af_mctp_send; 162 af_mctp->transport.init_pollfd = pldm_transport_af_mctp_init_pollfd; 163 af_mctp->socket = socket(AF_MCTP, SOCK_DGRAM, 0); 164 if (af_mctp->socket == -1) { 165 free(af_mctp); 166 return -1; 167 } 168 169 if (pldm_socket_sndbuf_init(&af_mctp->socket_send_buf, 170 af_mctp->socket)) { 171 close(af_mctp->socket); 172 free(af_mctp); 173 return -1; 174 } 175 176 *ctx = af_mctp; 177 return 0; 178 } 179 180 LIBPLDM_ABI_TESTING 181 void pldm_transport_af_mctp_destroy(struct pldm_transport_af_mctp *ctx) 182 { 183 if (!ctx) { 184 return; 185 } 186 close(ctx->socket); 187 free(ctx); 188 } 189