X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fipv4%2Ftcp_diag.c;h=c148c1081880a03aa1a7f24a692cb439f7ee3d70;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=305fe2eae69883593da854f93eba78cc5e78fcda;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c index 305fe2eae..c148c1081 100644 --- a/net/ipv4/tcp_diag.c +++ b/net/ipv4/tcp_diag.c @@ -1,5 +1,5 @@ /* - * tcp_diag.c Module for monitoring TCP sockets. + * tcp_diag.c Module for monitoring TCP transport protocols sockets. * * Version: $Id: tcp_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $ * @@ -12,637 +12,43 @@ */ #include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include - -#include -#include - -#include - -static struct sock *tcpnl; - - -#define TCPDIAG_PUT(skb, attrtype, attrlen) \ -({ int rtalen = RTA_LENGTH(attrlen); \ - struct rtattr *rta; \ - if (skb_tailroom(skb) < RTA_ALIGN(rtalen)) goto nlmsg_failure; \ - rta = (void*)__skb_put(skb, RTA_ALIGN(rtalen)); \ - rta->rta_type = attrtype; \ - rta->rta_len = rtalen; \ - RTA_DATA(rta); }) - -static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk, - int ext, u32 pid, u32 seq) -{ - struct inet_opt *inet = inet_sk(sk); - struct tcp_opt *tp = tcp_sk(sk); - struct tcpdiagmsg *r; - struct nlmsghdr *nlh; - struct tcp_info *info = NULL; - struct tcpdiag_meminfo *minfo = NULL; - struct tcpvegas_info *vinfo = NULL; - unsigned char *b = skb->tail; - - nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); - r = NLMSG_DATA(nlh); - if (sk->sk_state != TCP_TIME_WAIT) { - if (ext & (1<<(TCPDIAG_MEMINFO-1))) - minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo)); - if (ext & (1<<(TCPDIAG_INFO-1))) - info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info)); - - if (tcp_is_vegas(tp) && (ext & (1<<(TCPDIAG_VEGASINFO-1)))) - vinfo = TCPDIAG_PUT(skb, TCPDIAG_VEGASINFO, sizeof(*vinfo)); - } - r->tcpdiag_family = sk->sk_family; - r->tcpdiag_state = sk->sk_state; - r->tcpdiag_timer = 0; - r->tcpdiag_retrans = 0; - - r->id.tcpdiag_if = sk->sk_bound_dev_if; - r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk; - r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1); - - if (r->tcpdiag_state == TCP_TIME_WAIT) { - struct tcp_tw_bucket *tw = (struct tcp_tw_bucket*)sk; - long tmo = tw->tw_ttd - jiffies; - if (tmo < 0) - tmo = 0; - - r->id.tcpdiag_sport = tw->tw_sport; - r->id.tcpdiag_dport = tw->tw_dport; - r->id.tcpdiag_src[0] = tw->tw_rcv_saddr; - r->id.tcpdiag_dst[0] = tw->tw_daddr; - r->tcpdiag_state = tw->tw_substate; - r->tcpdiag_timer = 3; - r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ; - r->tcpdiag_rqueue = 0; - r->tcpdiag_wqueue = 0; - r->tcpdiag_uid = 0; - r->tcpdiag_inode = 0; -#ifdef CONFIG_IPV6 - if (r->tcpdiag_family == AF_INET6) { - ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, - &tw->tw_v6_rcv_saddr); - ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, - &tw->tw_v6_daddr); - } -#endif - nlh->nlmsg_len = skb->tail - b; - return skb->len; - } - - r->id.tcpdiag_sport = inet->sport; - r->id.tcpdiag_dport = inet->dport; - r->id.tcpdiag_src[0] = inet->rcv_saddr; - r->id.tcpdiag_dst[0] = inet->daddr; - -#ifdef CONFIG_IPV6 - if (r->tcpdiag_family == AF_INET6) { - struct ipv6_pinfo *np = inet6_sk(sk); - - ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, - &np->rcv_saddr); - ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, - &np->daddr); - } -#endif - -#define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ - - if (tp->pending == TCP_TIME_RETRANS) { - r->tcpdiag_timer = 1; - r->tcpdiag_retrans = tp->retransmits; - r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout); - } else if (tp->pending == TCP_TIME_PROBE0) { - r->tcpdiag_timer = 4; - r->tcpdiag_retrans = tp->probes_out; - r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout); - } else if (timer_pending(&sk->sk_timer)) { - r->tcpdiag_timer = 2; - r->tcpdiag_retrans = tp->probes_out; - r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires); - } else { - r->tcpdiag_timer = 0; - r->tcpdiag_expires = 0; - } -#undef EXPIRES_IN_MS - - r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq; - r->tcpdiag_wqueue = tp->write_seq - tp->snd_una; - r->tcpdiag_uid = sock_i_uid(sk); - r->tcpdiag_inode = sock_i_ino(sk); - - if (minfo) { - minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc); - minfo->tcpdiag_wmem = sk->sk_wmem_queued; - minfo->tcpdiag_fmem = sk->sk_forward_alloc; - minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc); - } - - if (info) { - u32 now = tcp_time_stamp; - - info->tcpi_state = sk->sk_state; - info->tcpi_ca_state = tp->ca_state; - info->tcpi_retransmits = tp->retransmits; - info->tcpi_probes = tp->probes_out; - info->tcpi_backoff = tp->backoff; - info->tcpi_options = 0; - if (tp->tstamp_ok) - info->tcpi_options |= TCPI_OPT_TIMESTAMPS; - if (tp->sack_ok) - info->tcpi_options |= TCPI_OPT_SACK; - if (tp->wscale_ok) { - info->tcpi_options |= TCPI_OPT_WSCALE; - info->tcpi_snd_wscale = tp->snd_wscale; - info->tcpi_rcv_wscale = tp->rcv_wscale; - } else { - info->tcpi_snd_wscale = 0; - info->tcpi_rcv_wscale = 0; - } - if (tp->ecn_flags&TCP_ECN_OK) - info->tcpi_options |= TCPI_OPT_ECN; - - info->tcpi_rto = (1000000*tp->rto)/HZ; - info->tcpi_ato = (1000000*tp->ack.ato)/HZ; - info->tcpi_snd_mss = tp->mss_cache; - info->tcpi_rcv_mss = tp->ack.rcv_mss; - - info->tcpi_unacked = tp->packets_out; - info->tcpi_sacked = tp->sacked_out; - info->tcpi_lost = tp->lost_out; - info->tcpi_retrans = tp->retrans_out; - info->tcpi_fackets = tp->fackets_out; - - info->tcpi_last_data_sent = ((now - tp->lsndtime)*1000)/HZ; - info->tcpi_last_ack_sent = 0; - info->tcpi_last_data_recv = ((now - tp->ack.lrcvtime)*1000)/HZ; - info->tcpi_last_ack_recv = ((now - tp->rcv_tstamp)*1000)/HZ; - - info->tcpi_pmtu = tp->pmtu_cookie; - info->tcpi_rcv_ssthresh = tp->rcv_ssthresh; - info->tcpi_rtt = ((1000000*tp->srtt)/HZ)>>3; - info->tcpi_rttvar = ((1000000*tp->mdev)/HZ)>>2; - info->tcpi_snd_ssthresh = tp->snd_ssthresh; - info->tcpi_snd_cwnd = tp->snd_cwnd; - info->tcpi_advmss = tp->advmss; - info->tcpi_reordering = tp->reordering; - } - - if (vinfo) { - vinfo->tcpv_enabled = tp->vegas.doing_vegas_now; - vinfo->tcpv_rttcnt = tp->vegas.cntRTT; - vinfo->tcpv_rtt = tp->vegas.baseRTT; - vinfo->tcpv_minrtt = tp->vegas.minRTT; - } - - nlh->nlmsg_len = skb->tail - b; - return skb->len; - -nlmsg_failure: - skb_trim(skb, b - skb->data); - return -1; -} - -extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport, int dif); -#ifdef CONFIG_IPV6 -extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, - struct in6_addr *daddr, u16 dport, - int dif); -#endif - -static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh) -{ - int err; - struct sock *sk; - struct tcpdiagreq *req = NLMSG_DATA(nlh); - struct sk_buff *rep; - - if (req->tcpdiag_family == AF_INET) { - sk = tcp_v4_lookup(req->id.tcpdiag_dst[0], req->id.tcpdiag_dport, - req->id.tcpdiag_src[0], req->id.tcpdiag_sport, - req->id.tcpdiag_if); - } -#ifdef CONFIG_IPV6 - else if (req->tcpdiag_family == AF_INET6) { - sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport, - (struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport, - req->id.tcpdiag_if); - } -#endif - else { - return -EINVAL; - } - - if (sk == NULL) - return -ENOENT; - - err = -ESTALE; - if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE || - req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) && - ((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] || - (u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1])) - goto out; - - err = -ENOMEM; - rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+ - sizeof(struct tcpdiag_meminfo)+ - sizeof(struct tcp_info)+64), GFP_KERNEL); - if (!rep) - goto out; - - if (tcpdiag_fill(rep, sk, req->tcpdiag_ext, - NETLINK_CB(in_skb).pid, - nlh->nlmsg_seq) <= 0) - BUG(); - - err = netlink_unicast(tcpnl, rep, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); - if (err > 0) - err = 0; - -out: - if (sk) { - if (sk->sk_state == TCP_TIME_WAIT) - tcp_tw_put((struct tcp_tw_bucket*)sk); - else - sock_put(sk); - } - return err; -} - -static int bitstring_match(const u32 *a1, const u32 *a2, int bits) -{ - int words = bits >> 5; - - bits &= 0x1f; - - if (words) { - if (memcmp(a1, a2, words << 2)) - return 0; - } - if (bits) { - __u32 w1, w2; - __u32 mask; - - w1 = a1[words]; - w2 = a2[words]; - - mask = htonl((0xffffffff) << (32 - bits)); - - if ((w1 ^ w2) & mask) - return 0; - } - return 1; -} - - -static int tcpdiag_bc_run(const void *bc, int len, struct sock *sk) -{ - while (len > 0) { - int yes = 1; - struct inet_opt *inet = inet_sk(sk); - const struct tcpdiag_bc_op *op = bc; - - switch (op->code) { - case TCPDIAG_BC_NOP: - break; - case TCPDIAG_BC_JMP: - yes = 0; - break; - case TCPDIAG_BC_S_GE: - yes = inet->num >= op[1].no; - break; - case TCPDIAG_BC_S_LE: - yes = inet->num <= op[1].no; - break; - case TCPDIAG_BC_D_GE: - yes = ntohs(inet->dport) >= op[1].no; - break; - case TCPDIAG_BC_D_LE: - yes = ntohs(inet->dport) <= op[1].no; - break; - case TCPDIAG_BC_AUTO: - yes = !(sk->sk_userlocks & SOCK_BINDPORT_LOCK); - break; - case TCPDIAG_BC_S_COND: - case TCPDIAG_BC_D_COND: - { - struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1); - u32 *addr; - - if (cond->port != -1 && - cond->port != (op->code == TCPDIAG_BC_S_COND ? - inet->num : ntohs(inet->dport))) { - yes = 0; - break; - } - - if (cond->prefix_len == 0) - break; - -#ifdef CONFIG_IPV6 - if (sk->sk_family == AF_INET6) { - struct ipv6_pinfo *np = inet6_sk(sk); - - if (op->code == TCPDIAG_BC_S_COND) - addr = (u32*)&np->rcv_saddr; - else - addr = (u32*)&np->daddr; - } else -#endif - { - if (op->code == TCPDIAG_BC_S_COND) - addr = &inet->rcv_saddr; - else - addr = &inet->daddr; - } - - if (bitstring_match(addr, cond->addr, cond->prefix_len)) - break; - if (sk->sk_family == AF_INET6 && - cond->family == AF_INET) { - if (addr[0] == 0 && addr[1] == 0 && - addr[2] == htonl(0xffff) && - bitstring_match(addr+3, cond->addr, cond->prefix_len)) - break; - } - yes = 0; - break; - } - } - - if (yes) { - len -= op->yes; - bc += op->yes; - } else { - len -= op->no; - bc += op->no; - } - } - return (len == 0); -} - -static int valid_cc(const void *bc, int len, int cc) -{ - while (len >= 0) { - const struct tcpdiag_bc_op *op = bc; - - if (cc > len) - return 0; - if (cc == len) - return 1; - if (op->yes < 4) - return 0; - len -= op->yes; - bc += op->yes; - } - return 0; -} - -static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len) -{ - const unsigned char *bc = bytecode; - int len = bytecode_len; - - while (len > 0) { - struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc; - -//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len); - switch (op->code) { - case TCPDIAG_BC_AUTO: - case TCPDIAG_BC_S_COND: - case TCPDIAG_BC_D_COND: - case TCPDIAG_BC_S_GE: - case TCPDIAG_BC_S_LE: - case TCPDIAG_BC_D_GE: - case TCPDIAG_BC_D_LE: - if (op->yes < 4 || op->yes > len+4) - return -EINVAL; - case TCPDIAG_BC_JMP: - if (op->no < 4 || op->no > len+4) - return -EINVAL; - if (op->no < len && - !valid_cc(bytecode, bytecode_len, len-op->no)) - return -EINVAL; - break; - case TCPDIAG_BC_NOP: - if (op->yes < 4 || op->yes > len+4) - return -EINVAL; - break; - default: - return -EINVAL; - } - bc += op->yes; - len -= op->yes; - } - return len == 0 ? 0 : -EINVAL; -} - - -static int tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb) -{ - int i, num; - int s_i, s_num; - struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); - struct rtattr *bc = NULL; - - if (cb->nlh->nlmsg_len > 4+NLMSG_SPACE(sizeof(struct tcpdiagreq))) - bc = (struct rtattr*)(r+1); - - s_i = cb->args[1]; - s_num = num = cb->args[2]; - - if (cb->args[0] == 0) { - if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV))) - goto skip_listen_ht; - tcp_listen_lock(); - for (i = s_i; i < TCP_LHTABLE_SIZE; i++) { - struct sock *sk; - struct hlist_node *node; - - if (i > s_i) - s_num = 0; - - num = 0; - sk_for_each(sk, node, &tcp_listening_hash[i]) { - struct inet_opt *inet = inet_sk(sk); - if (num < s_num) - continue; - if (!(r->tcpdiag_states&TCPF_LISTEN) || - r->id.tcpdiag_dport) - continue; - if (r->id.tcpdiag_sport != inet->sport && - r->id.tcpdiag_sport) - continue; - if (bc && !tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), sk)) - continue; - if (tcpdiag_fill(skb, sk, r->tcpdiag_ext, - NETLINK_CB(cb->skb).pid, - cb->nlh->nlmsg_seq) <= 0) { - tcp_listen_unlock(); - goto done; - } - ++num; - } - } - tcp_listen_unlock(); -skip_listen_ht: - cb->args[0] = 1; - s_i = num = s_num = 0; - } - - if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV))) - return skb->len; - - for (i = s_i; i < tcp_ehash_size; i++) { - struct tcp_ehash_bucket *head = &tcp_ehash[i]; - struct sock *sk; - struct hlist_node *node; - - if (i > s_i) - s_num = 0; - - read_lock_bh(&head->lock); - - num = 0; - sk_for_each(sk, node, &head->chain) { - struct inet_opt *inet = inet_sk(sk); - - if (num < s_num) - continue; - if (!(r->tcpdiag_states & (1 << sk->sk_state))) - continue; - if (r->id.tcpdiag_sport != inet->sport && - r->id.tcpdiag_sport) - continue; - if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport) - continue; - if (bc && !tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), sk)) - continue; - if (tcpdiag_fill(skb, sk, r->tcpdiag_ext, - NETLINK_CB(cb->skb).pid, - cb->nlh->nlmsg_seq) <= 0) { - read_unlock_bh(&head->lock); - goto done; - } - ++num; - } - - if (r->tcpdiag_states&TCPF_TIME_WAIT) { - sk_for_each(sk, node, - &tcp_ehash[i + tcp_ehash_size].chain) { - struct inet_opt *inet = inet_sk(sk); - - if (num < s_num) - continue; - if (!(r->tcpdiag_states & (1 << sk->sk_zapped))) - continue; - if (r->id.tcpdiag_sport != inet->sport && - r->id.tcpdiag_sport) - continue; - if (r->id.tcpdiag_dport != inet->dport && - r->id.tcpdiag_dport) - continue; - if (bc && !tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), sk)) - continue; - if (tcpdiag_fill(skb, sk, r->tcpdiag_ext, - NETLINK_CB(cb->skb).pid, - cb->nlh->nlmsg_seq) <= 0) { - read_unlock_bh(&head->lock); - goto done; - } - ++num; - } - } - read_unlock_bh(&head->lock); - } - -done: - cb->args[1] = i; - cb->args[2] = num; - return skb->len; -} +#include +#include -static int tcpdiag_dump_done(struct netlink_callback *cb) -{ - return 0; -} +#include +#include -static __inline__ int -tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) +static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, + void *_info) { - if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) - return 0; - - if (nlh->nlmsg_type != TCPDIAG_GETSOCK) - goto err_inval; + const struct tcp_sock *tp = tcp_sk(sk); + struct tcp_info *info = _info; - if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len) - goto err_inval; - - if (nlh->nlmsg_flags&NLM_F_DUMP) { - if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) { - struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq)); - if (rta->rta_type != TCPDIAG_REQ_BYTECODE || - rta->rta_len < 8 || - rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq))) - goto err_inval; - if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta))) - goto err_inval; - } - return netlink_dump_start(tcpnl, skb, nlh, - tcpdiag_dump, - tcpdiag_dump_done); - } else { - return tcpdiag_get_exact(skb, nlh); - } - -err_inval: - return -EINVAL; + r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq; + r->idiag_wqueue = tp->write_seq - tp->snd_una; + if (info != NULL) + tcp_get_info(sk, info); } +static struct inet_diag_handler tcp_diag_handler = { + .idiag_hashinfo = &tcp_hashinfo, + .idiag_get_info = tcp_diag_get_info, + .idiag_type = TCPDIAG_GETSOCK, + .idiag_info_size = sizeof(struct tcp_info), +}; -static inline void tcpdiag_rcv_skb(struct sk_buff *skb) +static int __init tcp_diag_init(void) { - int err; - struct nlmsghdr * nlh; - - if (skb->len >= NLMSG_SPACE(0)) { - nlh = (struct nlmsghdr *)skb->data; - if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) - return; - err = tcpdiag_rcv_msg(skb, nlh); - if (err || nlh->nlmsg_flags & NLM_F_ACK) - netlink_ack(skb, nlh, err); - } + return inet_diag_register(&tcp_diag_handler); } -static void tcpdiag_rcv(struct sock *sk, int len) +static void __exit tcp_diag_exit(void) { - struct sk_buff *skb; - - while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { - tcpdiag_rcv_skb(skb); - kfree_skb(skb); - } + inet_diag_unregister(&tcp_diag_handler); } -void __init tcpdiag_init(void) -{ - tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv); - if (tcpnl == NULL) - panic("tcpdiag_init: Cannot create netlink socket."); -} +module_init(tcp_diag_init); +module_exit(tcp_diag_exit); +MODULE_LICENSE("GPL");