diff options
Diffstat (limited to 'VNFs/DPPD-PROX/handle_master.c')
| -rw-r--r-- | VNFs/DPPD-PROX/handle_master.c | 353 |
1 files changed, 297 insertions, 56 deletions
diff --git a/VNFs/DPPD-PROX/handle_master.c b/VNFs/DPPD-PROX/handle_master.c index de0c0d51..fcc39eb4 100644 --- a/VNFs/DPPD-PROX/handle_master.c +++ b/VNFs/DPPD-PROX/handle_master.c @@ -15,11 +15,17 @@ */ #include <fcntl.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <linux/netlink.h> +#include <linux/rtnetlink.h> +#include <poll.h> #include <rte_hash.h> #include <rte_hash_crc.h> -#include "prox_cfg.h" +#include <rte_ether.h> +#include "prox_cfg.h" #include "prox_globals.h" #include "rx_pkt.h" #include "arp.h" @@ -28,7 +34,6 @@ #include "mbuf_utils.h" #include "etypes.h" #include "defaults.h" -#include "prox_cfg.h" #include "prox_malloc.h" #include "quit.h" #include "task_init.h" @@ -40,9 +45,20 @@ #include "defines.h" #define PROX_MAX_ARP_REQUESTS 32 // Maximum number of tasks requesting the same MAC address -#define SET_NON_BLOCKING(X) fcntl(X, F_SETFL, fcntl(X, F_GETFL) | O_NONBLOCK); - -const char *actions_string[] = {"UPDATE_FROM_CTRL", "SEND_ARP_REQUEST_FROM_CTRL", "SEND_ARP_REPLY_FROM_CTRL", "HANDLE_ARP_TO_CTRL", "REQ_MAC_TO_CTRL", "PKT_FROM_TAP"}; +#define NETLINK_BUF_SIZE 16384 + +static char netlink_buf[NETLINK_BUF_SIZE]; + +const char *actions_string[] = { + "UPDATE_FROM_CTRL", // Controlplane sending a MAC update to dataplane + "SEND_ARP_REQUEST_FROM_CTRL", // Controlplane requesting dataplane to send ARP request + "SEND_ARP_REPLY_FROM_CTRL", // Controlplane requesting dataplane to send ARP reply + "SEND_ICMP_FROM_CTRL", // Controlplane requesting dataplane to send ICMP message + "ARP_TO_CTRL", // ARP sent by datplane to Controlpane for handling + "ICMP_TO_CTRL", // ICMP sent by datplane to Controlpane for handling + "REQ_MAC_TO_CTRL", // Dataplane requesting MAC resolution to Controlplane + "PKT_FROM_TAP" // Packet received by Controlplane from kernel and forwarded to dataplane for sending +}; static struct my_arp_t arp_reply = { .htype = 0x100, @@ -76,6 +92,10 @@ struct port_table { uint32_t ip; uint8_t port; uint8_t flags; + uint64_t last_echo_req_rcvd_tsc; + uint64_t last_echo_rep_rcvd_tsc; + uint32_t n_echo_req; + uint32_t n_echo_rep; }; struct task_master { @@ -89,6 +109,7 @@ struct task_master { struct port_table internal_port_table[PROX_MAX_PORTS]; struct vdev all_vdev[PROX_MAX_PORTS]; int max_vdev_id; + struct pollfd arp_fds; }; struct ip_port { @@ -121,15 +142,23 @@ void master_init_vdev(struct task_base *tbase, uint8_t port_id, uint8_t core_id, { struct task_master *task = (struct task_master *)tbase; uint8_t vdev_port = prox_port_cfg[port_id].dpdk_mapping; - int rc; + int rc, i; if (vdev_port != NO_VDEV_PORT) { + for (i = 0; i < task->max_vdev_id; i++) { + if (task->all_vdev[i].port_id == vdev_port) + break; + } + if (i < task->max_vdev_id) { + // Already initialized (e.g. by another core handling the same port). + return; + } task->all_vdev[task->max_vdev_id].port_id = vdev_port; task->all_vdev[task->max_vdev_id].ring = task->ctrl_tx_rings[core_id * MAX_TASKS_PER_CORE + task_id]; struct sockaddr_in dst, src; src.sin_family = AF_INET; src.sin_addr.s_addr = prox_port_cfg[vdev_port].ip; - src.sin_port = 5000; + src.sin_port = rte_cpu_to_be_16(5000); int fd = socket(AF_INET, SOCK_DGRAM, 0); PROX_PANIC(fd < 0, "Failed to open socket(AF_INET, SOCK_DGRAM, 0)\n"); @@ -137,7 +166,7 @@ void master_init_vdev(struct task_base *tbase, uint8_t port_id, uint8_t core_id, rc = bind(fd,(struct sockaddr *)&src, sizeof(struct sockaddr_in)); PROX_PANIC(rc, "Failed to bind("IPv4_BYTES_FMT":%d): errno = %d\n", IPv4_BYTES(((uint8_t*)&src.sin_addr.s_addr)), src.sin_port, errno); plog_info("DPDK port %d bound("IPv4_BYTES_FMT":%d) to fd %d\n", port_id, IPv4_BYTES(((uint8_t*)&src.sin_addr.s_addr)), src.sin_port, fd); - SET_NON_BLOCKING(fd); + fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); task->max_vdev_id++; } } @@ -146,10 +175,10 @@ void register_ip_to_ctrl_plane(struct task_base *tbase, uint32_t ip, uint8_t por { struct task_master *task = (struct task_master *)tbase; struct ip_port key; - plogx_info("\tregistering IP %d.%d.%d.%d with port %d core %d and task %d\n", IP4(ip), port_id, core_id, task_id); + plogx_info("\tregistering IP "IPv4_BYTES_FMT" with port %d core %d and task %d\n", IP4(ip), port_id, core_id, task_id); if (port_id >= PROX_MAX_PORTS) { - plog_err("Unable to register ip %d.%d.%d.%d, port %d\n", IP4(ip), port_id); + plog_err("Unable to register ip "IPv4_BYTES_FMT", port %d\n", IP4(ip), port_id); return; } @@ -157,7 +186,7 @@ void register_ip_to_ctrl_plane(struct task_base *tbase, uint32_t ip, uint8_t por Remove them when such cores are stopped and de-register IP */ task->internal_port_table[port_id].ring = task->ctrl_tx_rings[core_id * MAX_TASKS_PER_CORE + task_id]; - memcpy(&task->internal_port_table[port_id].mac, &prox_port_cfg[port_id].eth_addr, 6); + memcpy(&task->internal_port_table[port_id].mac, &prox_port_cfg[port_id].eth_addr, sizeof(prox_rte_ether_addr)); task->internal_port_table[port_id].ip = ip; if (ip == RANDOM_IP) { @@ -169,10 +198,10 @@ void register_ip_to_ctrl_plane(struct task_base *tbase, uint32_t ip, uint8_t por key.port = port_id; int ret = rte_hash_add_key(task->internal_ip_hash, (const void *)&key); if (unlikely(ret < 0)) { - plog_err("Unable to register ip %d.%d.%d.%d\n", IP4(ip)); + plog_err("Unable to register ip "IPv4_BYTES_FMT"\n", IP4(ip)); return; } - memcpy(&task->internal_ip_table[ret].mac, &prox_port_cfg[port_id].eth_addr, 6); + memcpy(&task->internal_ip_table[ret].mac, &prox_port_cfg[port_id].eth_addr, sizeof(prox_rte_ether_addr)); task->internal_ip_table[ret].ring = task->ctrl_tx_rings[core_id * MAX_TASKS_PER_CORE + task_id]; } @@ -183,7 +212,7 @@ static inline void handle_arp_reply(struct task_base *tbase, struct rte_mbuf *mb struct ether_hdr_arp *hdr_arp = rte_pktmbuf_mtod(mbuf, struct ether_hdr_arp *); int i, ret; uint32_t key = hdr_arp->arp.data.spa; - plogx_dbg("\tMaster handling ARP reply for ip %d.%d.%d.%d\n", IP4(key)); + plogx_dbg("\tMaster handling ARP reply for ip "IPv4_BYTES_FMT"\n", IP4(key)); ret = rte_hash_lookup(task->external_ip_hash, (const void *)&key); if (unlikely(ret < 0)) { @@ -192,7 +221,6 @@ static inline void handle_arp_reply(struct task_base *tbase, struct rte_mbuf *mb } else { // entry found for this IP uint16_t nb_requests = task->external_ip_table[ret].nb_requests; - memcpy(&hdr_arp->ether_hdr.d_addr.addr_bytes, &task->external_ip_table[ret].mac, 6); // If we receive a request from multiple task for the same IP, then we update all tasks if (task->external_ip_table[ret].nb_requests) { rte_mbuf_refcnt_set(mbuf, nb_requests); @@ -219,7 +247,7 @@ static inline void handle_arp_request(struct task_base *tbase, struct rte_mbuf * key.port = port; if (task->internal_port_table[port].flags & HANDLE_RANDOM_IP_FLAG) { prox_rte_ether_addr mac; - plogx_dbg("\tMaster handling ARP request for ip %d.%d.%d.%d on port %d which supports random ip\n", IP4(key.ip), key.port); + plogx_dbg("\tMaster handling ARP request for ip "IPv4_BYTES_FMT" on port %d which supports random ip\n", IP4(key.ip), key.port); struct rte_ring *ring = task->internal_port_table[port].ring; create_mac(hdr_arp, &mac); mbuf->ol_flags &= ~(PKT_TX_IP_CKSUM|PKT_TX_UDP_CKSUM); @@ -228,12 +256,12 @@ static inline void handle_arp_request(struct task_base *tbase, struct rte_mbuf * return; } - plogx_dbg("\tMaster handling ARP request for ip %d.%d.%d.%d\n", IP4(key.ip)); + plogx_dbg("\tMaster handling ARP request for ip "IPv4_BYTES_FMT"\n", IP4(key.ip)); ret = rte_hash_lookup(task->internal_ip_hash, (const void *)&key); if (unlikely(ret < 0)) { // entry not found for this IP. - plogx_dbg("Master ignoring ARP REQUEST received on un-registered IP %d.%d.%d.%d on port %d\n", IP4(hdr_arp->arp.data.tpa), port); + plogx_dbg("Master ignoring ARP REQUEST received on un-registered IP "IPv4_BYTES_FMT" on port %d\n", IP4(hdr_arp->arp.data.tpa), port); tx_drop(mbuf); } else { struct rte_ring *ring = task->internal_ip_table[ret].ring; @@ -243,15 +271,46 @@ static inline void handle_arp_request(struct task_base *tbase, struct rte_mbuf * } } +static inline int record_request(struct task_base *tbase, uint32_t ip_dst, uint8_t port, struct rte_ring *ring) +{ + struct task_master *task = (struct task_master *)tbase; + int ret = rte_hash_add_key(task->external_ip_hash, (const void *)&ip_dst); + int i; + + if (unlikely(ret < 0)) { + // entry not found for this IP: delete the reply + plogx_dbg("Unable to add IP "IPv4_BYTES_FMT" in external_ip_hash\n", IP4(ip_dst)); + return -1; + } + + // If multiple tasks requesting the same info, we will need to send a reply to all of them + // However if one task sends multiple requests to the same IP (e.g. because it is not answering) + // then we should not send multiple replies to the same task + if (task->external_ip_table[ret].nb_requests >= PROX_MAX_ARP_REQUESTS) { + // This can only happen if really many tasks requests the same IP + plogx_dbg("Unable to add request for IP "IPv4_BYTES_FMT" in external_ip_table\n", IP4(ip_dst)); + return -1; + } + for (i = 0; i < task->external_ip_table[ret].nb_requests; i++) { + if (task->external_ip_table[ret].rings[i] == ring) + break; + } + if (i >= task->external_ip_table[ret].nb_requests) { + // If this is a new request i.e. a new task requesting a new IP + task->external_ip_table[ret].rings[task->external_ip_table[ret].nb_requests] = ring; + task->external_ip_table[ret].nb_requests++; + } + return 0; +} + static inline void handle_unknown_ip(struct task_base *tbase, struct rte_mbuf *mbuf) { struct task_master *task = (struct task_master *)tbase; struct ether_hdr_arp *hdr_arp = rte_pktmbuf_mtod(mbuf, struct ether_hdr_arp *); uint8_t port = get_port(mbuf); uint32_t ip_dst = get_ip(mbuf); - int ret1, ret2, i; - plogx_dbg("\tMaster handling unknown ip %d.%d.%d.%d for port %d\n", IP4(ip_dst), port); + plogx_dbg("\tMaster handling unknown ip "IPv4_BYTES_FMT" for port %d\n", IP4(ip_dst), port); if (unlikely(port >= PROX_MAX_PORTS)) { plogx_dbg("Port %d not found", port); tx_drop(mbuf); @@ -266,40 +325,85 @@ static inline void handle_unknown_ip(struct task_base *tbase, struct rte_mbuf *m return; } - ret2 = rte_hash_add_key(task->external_ip_hash, (const void *)&ip_dst); - if (unlikely(ret2 < 0)) { - // entry not found for this IP: delete the reply - plogx_dbg("Unable to add IP %d.%d.%d.%d in external_ip_hash\n", IP4(ip_dst)); + if (record_request(tbase, ip_dst, port, ring) < 0) { tx_drop(mbuf); return; } + // We send an ARP request even if one was just sent (and not yet answered) by another task + mbuf->ol_flags &= ~(PKT_TX_IP_CKSUM|PKT_TX_UDP_CKSUM); + build_arp_request(mbuf, &task->internal_port_table[port].mac, ip_dst, ip_src); + tx_ring(tbase, ring, ARP_REQ_FROM_CTRL, mbuf); +} - // If multiple tasks requesting the same info, we will need to send a reply to all of them - // However if one task sends multiple requests to the same IP (e.g. because it is not answering) - // then we should not send multiple replies to the same task - if (task->external_ip_table[ret2].nb_requests >= PROX_MAX_ARP_REQUESTS) { - // This can only happen if really many tasks requests the same IP - plogx_dbg("Unable to add request for IP %d.%d.%d.%d in external_ip_table\n", IP4(ip_dst)); +static inline void build_icmp_reply_message(struct task_base *tbase, struct rte_mbuf *mbuf) +{ + struct task_master *task = (struct task_master *)tbase; + struct ip_port key; + key.port = mbuf->port; + prox_rte_ether_hdr *hdr = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *); + prox_rte_ether_addr dst_mac; + prox_rte_ether_addr_copy(&hdr->s_addr, &dst_mac); + prox_rte_ether_addr_copy(&hdr->d_addr, &hdr->s_addr); + prox_rte_ether_addr_copy(&dst_mac, &hdr->d_addr); + prox_rte_ipv4_hdr *ip_hdr = (prox_rte_ipv4_hdr *)(hdr + 1); + key.ip = ip_hdr->dst_addr; + ip_hdr->dst_addr = ip_hdr->src_addr; + ip_hdr->src_addr = key.ip; + prox_rte_icmp_hdr *picmp = (prox_rte_icmp_hdr *)(ip_hdr + 1); + picmp->icmp_type = PROX_RTE_IP_ICMP_ECHO_REPLY; + + int ret = rte_hash_lookup(task->internal_ip_hash, (const void *)&key); + if (unlikely(ret < 0)) { + // entry not found for this IP. + plogx_dbg("Master ignoring ICMP received on un-registered IP "IPv4_BYTES_FMT" on port %d\n", IP4(key.ip), mbuf->port); + tx_drop(mbuf); + } else { + struct rte_ring *ring = task->internal_ip_table[ret].ring; + mbuf->ol_flags &= ~(PKT_TX_IP_CKSUM|PKT_TX_UDP_CKSUM); + tx_ring(tbase, ring, ICMP_FROM_CTRL, mbuf); + } +} + +static inline void handle_icmp(struct task_base *tbase, struct rte_mbuf *mbuf) +{ + struct task_master *task = (struct task_master *)tbase; + uint8_t port_id = mbuf->port; + struct port_table *port = &task->internal_port_table[port_id]; + prox_rte_ether_hdr *hdr = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *); + if (hdr->ether_type != ETYPE_IPv4) { tx_drop(mbuf); return; } - for (i = 0; i < task->external_ip_table[ret2].nb_requests; i++) { - if (task->external_ip_table[ret2].rings[i] == ring) - break; + prox_rte_ipv4_hdr *ip_hdr = (prox_rte_ipv4_hdr *)(hdr + 1); + if (ip_hdr->next_proto_id != IPPROTO_ICMP) { + tx_drop(mbuf); + return; } - if (i >= task->external_ip_table[ret2].nb_requests) { - // If this is a new request i.e. a new task requesting a new IP - task->external_ip_table[ret2].rings[task->external_ip_table[ret2].nb_requests] = ring; - task->external_ip_table[ret2].nb_requests++; - // Only needed for first request - but avoid test and copy the same 6 bytes - // In most cases we will only have one request per IP. - memcpy(&task->external_ip_table[ret2].mac, &task->internal_port_table[port].mac, 6); + if (ip_hdr->dst_addr != port->ip) { + tx_drop(mbuf); + return; } - // We send an ARP request even if one was just sent (and not yet answered) by another task - mbuf->ol_flags &= ~(PKT_TX_IP_CKSUM|PKT_TX_UDP_CKSUM); - build_arp_request(mbuf, &task->internal_port_table[port].mac, ip_dst, ip_src); - tx_ring(tbase, ring, ARP_REQ_FROM_CTRL, mbuf); + prox_rte_icmp_hdr *picmp = (prox_rte_icmp_hdr *)(ip_hdr + 1); + uint8_t type = picmp->icmp_type; + if (type == PROX_RTE_IP_ICMP_ECHO_REQUEST) { + port->n_echo_req++; + if (rte_rdtsc() - port->last_echo_req_rcvd_tsc > rte_get_tsc_hz()) { + plog_dbg("Received %u Echo Request on IP "IPv4_BYTES_FMT" (last received from IP "IPv4_BYTES_FMT")\n", port->n_echo_req, IPv4_BYTES(((uint8_t*)&ip_hdr->dst_addr)), IPv4_BYTES(((uint8_t*)&ip_hdr->src_addr))); + port->n_echo_req = 0; + port->last_echo_req_rcvd_tsc = rte_rdtsc(); + } + build_icmp_reply_message(tbase, mbuf); + } else if (type == PROX_RTE_IP_ICMP_ECHO_REPLY) { + port->n_echo_rep++; + if (rte_rdtsc() - port->last_echo_rep_rcvd_tsc > rte_get_tsc_hz()) { + plog_info("Received %u Echo Reply on IP "IPv4_BYTES_FMT" (last received from IP "IPv4_BYTES_FMT")\n", port->n_echo_rep, IPv4_BYTES(((uint8_t*)&ip_hdr->dst_addr)), IPv4_BYTES(((uint8_t*)&ip_hdr->src_addr))); + port->n_echo_rep = 0; + port->last_echo_rep_rcvd_tsc = rte_rdtsc(); + } + } + tx_drop(mbuf); + return; } static inline void handle_message(struct task_base *tbase, struct rte_mbuf *mbuf, int ring_id) @@ -313,16 +417,27 @@ static inline void handle_message(struct task_base *tbase, struct rte_mbuf *mbuf plogx_dbg("\tMaster received %s (%x) from mbuf %p\n", actions_string[command], command, mbuf); switch(command) { + case ICMP_TO_CTRL: + if (vdev_port != NO_VDEV_PORT) { + // If a virtual (net_tap) device is attached, send the (PING) packet to this device + // The kernel will receive and handle it. + plogx_dbg("\tMaster forwarding packet to TAP\n"); + int n = rte_eth_tx_burst(prox_port_cfg[port].dpdk_mapping, 0, &mbuf, 1); + return; + } + handle_icmp(tbase, mbuf); + break; case ARP_TO_CTRL: if (vdev_port != NO_VDEV_PORT) { // If a virtual (net_tap) device is attached, send the (ARP) packet to this device // The kernel will receive and handle it. + plogx_dbg("\tMaster forwarding packet to TAP\n"); int n = rte_eth_tx_burst(prox_port_cfg[port].dpdk_mapping, 0, &mbuf, 1); return; } if (hdr_arp->ether_hdr.ether_type != ETYPE_ARP) { - tx_drop(mbuf); plog_err("\tUnexpected message received: ARP_TO_CTRL with ether_type %x\n", hdr_arp->ether_hdr.ether_type); + tx_drop(mbuf); return; } else if (arp_is_gratuitous(hdr_arp)) { plog_info("\tReceived gratuitous packet \n"); @@ -346,18 +461,34 @@ static inline void handle_message(struct task_base *tbase, struct rte_mbuf *mbuf // be sent from the same IP src. This might be a limitation. // This prevent to have to open as many sockets as there are sources MAC addresses // We also always use the same UDP ports - as the packet will finally not leave the system anyhow - // Content of udp might be garbage - we do not care. - prox_rte_ether_hdr *hdr = rte_pktmbuf_mtod(mbuf, prox_rte_ether_hdr *); - prox_rte_ipv4_hdr *ip_hdr = (prox_rte_ipv4_hdr *)(hdr + 1); - prox_rte_udp_hdr *udp = (prox_rte_udp_hdr *)(ip_hdr + 1); + struct ether_hdr_arp *hdr_arp = rte_pktmbuf_mtod(mbuf, struct ether_hdr_arp *); + uint32_t ip = get_ip(mbuf); + struct rte_ring *ring = task->ctrl_tx_rings[get_core(mbuf) * MAX_TASKS_PER_CORE + get_task(mbuf)]; + + // First check whether MAC address is not already in kernel MAC table. + // If present in our hash with a non-null MAC, then present in kernel. A null MAC + // might just mean that we sent a request. + // If MAC present in kernel, do not send a packet towards the kernel to try to generate + // an ARP request, as the kernel would not generate it. + int ret = rte_hash_lookup(task->external_ip_hash, (const void *)&ip); + if ((ret >= 0) && (!prox_rte_is_zero_ether_addr(&task->external_ip_table[ret].mac))) { + memcpy(&hdr_arp->arp.data.sha, &task->external_ip_table[ret].mac, sizeof(prox_rte_ether_addr)); + plogx_dbg("\tMaster ready to send UPDATE_FROM_CTRL ip "IPv4_BYTES_FMT" with mac "MAC_BYTES_FMT"\n", + IP4(ip), MAC_BYTES(hdr_arp->arp.data.sha.addr_bytes)); + tx_ring_ip(tbase, ring, UPDATE_FROM_CTRL, mbuf, ip); + return; + } struct sockaddr_in dst; dst.sin_family = AF_INET; - dst.sin_addr.s_addr = ip_hdr->dst_addr; - dst.sin_port = 5000; - int n = sendto(prox_port_cfg[vdev_port].fd, (char*)(udp + 1), 18, 0, (struct sockaddr *)&dst, sizeof(struct sockaddr_in)); - plog_dbg("Sent %d bytes to "IPv4_BYTES_FMT" using fd %d\n", n, IPv4_BYTES(((uint8_t*)&ip_hdr->dst_addr)), prox_port_cfg[vdev_port].fd); + dst.sin_addr.s_addr = ip; + dst.sin_port = rte_cpu_to_be_16(5000); + int n = sendto(prox_port_cfg[vdev_port].fd, (char*)(&ip), 0, 0, (struct sockaddr *)&dst, sizeof(struct sockaddr_in)); + plogx_dbg("\tSent %d bytes to TAP IP "IPv4_BYTES_FMT" using fd %d\n", n, IPv4_BYTES(((uint8_t*)&ip)), prox_port_cfg[vdev_port].fd); + + record_request(tbase, ip, port, ring); + tx_drop(mbuf); break; } handle_unknown_ip(tbase, mbuf); @@ -373,9 +504,10 @@ void init_ctrl_plane(struct task_base *tbase) { prox_cfg.flags |= DSF_CTRL_PLANE_ENABLED; struct task_master *task = (struct task_master *)tbase; - int socket = rte_lcore_to_socket_id(prox_cfg.master); + int socket_id = rte_lcore_to_socket_id(prox_cfg.master); uint32_t n_entries = MAX_ARP_ENTRIES * 4; static char hash_name[30]; + sprintf(hash_name, "A%03d_hash_arp_table", prox_cfg.master); struct rte_hash_parameters hash_params = { .name = hash_name, @@ -387,7 +519,7 @@ void init_ctrl_plane(struct task_base *tbase) task->external_ip_hash = rte_hash_create(&hash_params); PROX_PANIC(task->external_ip_hash == NULL, "Failed to set up external ip hash\n"); plog_info("\texternal ip hash table allocated, with %d entries of size %d\n", hash_params.entries, hash_params.key_len); - task->external_ip_table = (struct external_ip_table *)prox_zmalloc(n_entries * sizeof(struct external_ip_table), socket); + task->external_ip_table = (struct external_ip_table *)prox_zmalloc(n_entries * sizeof(struct external_ip_table), socket_id); PROX_PANIC(task->external_ip_table == NULL, "Failed to allocate memory for %u entries in external ip table\n", n_entries); plog_info("\texternal ip table, with %d entries of size %ld\n", n_entries, sizeof(struct external_ip_table)); @@ -396,9 +528,35 @@ void init_ctrl_plane(struct task_base *tbase) task->internal_ip_hash = rte_hash_create(&hash_params); PROX_PANIC(task->internal_ip_hash == NULL, "Failed to set up internal ip hash\n"); plog_info("\tinternal ip hash table allocated, with %d entries of size %d\n", hash_params.entries, hash_params.key_len); - task->internal_ip_table = (struct ip_table *)prox_zmalloc(n_entries * sizeof(struct ip_table), socket); + task->internal_ip_table = (struct ip_table *)prox_zmalloc(n_entries * sizeof(struct ip_table), socket_id); PROX_PANIC(task->internal_ip_table == NULL, "Failed to allocate memory for %u entries in internal ip table\n", n_entries); plog_info("\tinternal ip table, with %d entries of size %ld\n", n_entries, sizeof(struct ip_table)); + + int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); + PROX_PANIC(fd < 0, "Failed to open netlink socket: %d\n", errno); + fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_NONBLOCK); + + struct sockaddr_nl sockaddr; + memset(&sockaddr, 0, sizeof(struct sockaddr_nl)); + sockaddr.nl_family = AF_NETLINK; + sockaddr.nl_groups = RTMGRP_NEIGH | RTMGRP_NOTIFY; + int rc = bind(fd, (struct sockaddr *)&sockaddr, sizeof(struct sockaddr_nl)); + PROX_PANIC(rc < 0, "Failed to bind to RTMGRP_NEIGH netlink group\n"); + task->arp_fds.fd = fd; + task->arp_fds.events = POLL_IN; + plog_info("\tRTMGRP_NEIGH netlink group bound; fd = %d\n", fd); + static char name[] = "master_arp_pool"; + const int NB_ARP_MBUF = 1024; + const int ARP_MBUF_SIZE = 2048; + const int NB_CACHE_ARP_MBUF = 256; + struct rte_mempool *ret = rte_mempool_create(name, NB_ARP_MBUF, ARP_MBUF_SIZE, NB_CACHE_ARP_MBUF, + sizeof(struct rte_pktmbuf_pool_private), rte_pktmbuf_pool_init, NULL, rte_pktmbuf_init, 0, + rte_socket_id(), 0); + PROX_PANIC(ret == NULL, "Failed to allocate ARP memory pool on socket %u with %u elements\n", + rte_socket_id(), NB_ARP_MBUF); + plog_info("\t\tMempool %p (%s) size = %u * %u cache %u, socket %d\n", ret, name, NB_ARP_MBUF, + ARP_MBUF_SIZE, NB_CACHE_ARP_MBUF, rte_socket_id()); + tbase->l3.arp_pool = ret; } static int handle_ctrl_plane_f(struct task_base *tbase, __attribute__((unused)) struct rte_mbuf **mbuf, uint16_t n_pkts) @@ -424,6 +582,89 @@ static int handle_ctrl_plane_f(struct task_base *tbase, __attribute__((unused)) } ret +=n; } + if (poll(&task->arp_fds, 1, prox_cfg.poll_timeout) == POLL_IN) { + struct nlmsghdr * nl_hdr; + int fd = task->arp_fds.fd; + int len; + uint32_t ip = 0; + prox_rte_ether_addr mac; + memset(&mac, 0, sizeof(mac)); + len = recv(fd, netlink_buf, sizeof(netlink_buf), 0); + if (len < 0) { + plog_err("Failed to recv from netlink: %d\n", errno); + return errno; + } + nl_hdr = (struct nlmsghdr *)netlink_buf; + if (nl_hdr->nlmsg_flags & NLM_F_MULTI) { + plog_err("Unexpected multipart netlink message\n"); + return -1; + } + if ((nl_hdr->nlmsg_type != RTM_NEWNEIGH) && (nl_hdr->nlmsg_type != RTM_DELNEIGH)) + return 0; + + struct ndmsg *ndmsg = (struct ndmsg *)NLMSG_DATA(nl_hdr); + int ndm_family = ndmsg->ndm_family; + struct rtattr *rta = (struct rtattr *)RTM_RTA(ndmsg); + int rtl = RTM_PAYLOAD(nl_hdr); + for (; RTA_OK(rta, rtl); rta = RTA_NEXT(rta, rtl)) { + switch (rta->rta_type) { + case NDA_DST: + ip = *((uint32_t *)RTA_DATA(rta)); + break; + case NDA_LLADDR: + mac = *((prox_rte_ether_addr *)(uint64_t *)RTA_DATA(rta)); + break; + default: + break; + } + } + ret = rte_hash_lookup(task->external_ip_hash, (const void *)&ip); + if (unlikely(ret < 0)) { + // entry not found for this IP: we did not ask a request. + // This can happen if the kernel updated the ARP table when receiving an ARP_REQUEST + // We must record this, as the ARP entry is now in the kernel table + if (prox_rte_is_zero_ether_addr(&mac)) { + // Timeout or MAC deleted from kernel MAC table + int ret = rte_hash_del_key(task->external_ip_hash, (const void *)&ip); + plogx_dbg("ip "IPv4_BYTES_FMT" removed from external_ip_hash\n", IP4(ip)); + return 0; + } + int ret = rte_hash_add_key(task->external_ip_hash, (const void *)&ip); + if (unlikely(ret < 0)) { + // entry not found for this IP: Ignore the reply. This can happen for instance for + // an IP used by management plane. + plogx_dbg("IP "IPv4_BYTES_FMT" not found in external_ip_hash and unable to add it\n", IP4(ip)); + return -1; + } + memcpy(&task->external_ip_table[ret].mac, &mac, sizeof(prox_rte_ether_addr)); + plogx_dbg("ip "IPv4_BYTES_FMT" added in external_ip_hash with mac "MAC_BYTES_FMT"\n", IP4(ip), MAC_BYTES(mac.addr_bytes)); + return 0; + } + + // entry found for this IP + uint16_t nb_requests = task->external_ip_table[ret].nb_requests; + if (nb_requests == 0) { + return 0; + } + + memcpy(&task->external_ip_table[ret].mac, &mac, sizeof(prox_rte_ether_addr)); + + // If we receive a request from multiple task for the same IP, then we update all tasks + ret = rte_mempool_get(tbase->l3.arp_pool, (void **)mbufs); + if (unlikely(ret != 0)) { + plog_err("Unable to allocate a mbuf for master to core communication\n"); + return -1; + } + rte_mbuf_refcnt_set(mbufs[0], nb_requests); + for (int i = 0; i < nb_requests; i++) { + struct rte_ring *ring = task->external_ip_table[ret].rings[i]; + struct ether_hdr_arp *hdr = rte_pktmbuf_mtod(mbufs[0], struct ether_hdr_arp *); + memcpy(&hdr->arp.data.sha, &mac, sizeof(prox_rte_ether_addr)); + tx_ring_ip(tbase, ring, UPDATE_FROM_CTRL, mbufs[0], ip); + plog_dbg("UPDATE_FROM_CTRL ip "IPv4_BYTES_FMT" with mac "MAC_BYTES_FMT"\n", IP4(ip), MAC_BYTES(mac.addr_bytes)); + } + task->external_ip_table[ret].nb_requests = 0; + } return ret; } |