diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv4/tcp_diag.c | |
download | kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/ipv4/tcp_diag.c')
-rw-r--r-- | net/ipv4/tcp_diag.c | 802 |
1 files changed, 802 insertions, 0 deletions
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c new file mode 100644 index 0000000..313c140 --- /dev/null +++ b/net/ipv4/tcp_diag.c @@ -0,0 +1,802 @@ +/* + * tcp_diag.c Module for monitoring TCP sockets. + * + * Version: $Id: tcp_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $ + * + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/random.h> +#include <linux/cache.h> +#include <linux/init.h> +#include <linux/time.h> + +#include <net/icmp.h> +#include <net/tcp.h> +#include <net/ipv6.h> +#include <net/inet_common.h> + +#include <linux/inet.h> +#include <linux/stddef.h> + +#include <linux/tcp_diag.h> + +struct tcpdiag_entry +{ + u32 *saddr; + u32 *daddr; + u16 sport; + u16 dport; + u16 family; + u16 userlocks; +}; + +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, u16 nlmsg_flags) +{ + struct inet_sock *inet = inet_sk(sk); + struct tcp_sock *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)); + nlh->nlmsg_flags = nlmsg_flags; + 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_westwood(tp) || 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_IP_TCPDIAG_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_IP_TCPDIAG_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) + tcp_get_info(sk, info); + + if (vinfo) { + if (tcp_is_vegas(tp)) { + vinfo->tcpv_enabled = tp->vegas.doing_vegas_now; + vinfo->tcpv_rttcnt = tp->vegas.cntRTT; + vinfo->tcpv_rtt = jiffies_to_usecs(tp->vegas.baseRTT); + vinfo->tcpv_minrtt = jiffies_to_usecs(tp->vegas.minRTT); + } else { + vinfo->tcpv_enabled = 0; + vinfo->tcpv_rttcnt = 0; + vinfo->tcpv_rtt = jiffies_to_usecs(tp->westwood.rtt); + vinfo->tcpv_minrtt = jiffies_to_usecs(tp->westwood.rtt_min); + } + } + + 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_IP_TCPDIAG_IPV6 +extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, + struct in6_addr *daddr, u16 dport, + int dif); +#else +static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport, + struct in6_addr *daddr, u16 dport, + int dif) +{ + return NULL; +} +#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_IP_TCPDIAG_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) <= 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, + const struct tcpdiag_entry *entry) +{ + while (len > 0) { + int yes = 1; + 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 = entry->sport >= op[1].no; + break; + case TCPDIAG_BC_S_LE: + yes = entry->dport <= op[1].no; + break; + case TCPDIAG_BC_D_GE: + yes = entry->dport >= op[1].no; + break; + case TCPDIAG_BC_D_LE: + yes = entry->dport <= op[1].no; + break; + case TCPDIAG_BC_AUTO: + yes = !(entry->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 ? + entry->sport : entry->dport)) { + yes = 0; + break; + } + + if (cond->prefix_len == 0) + break; + + if (op->code == TCPDIAG_BC_S_COND) + addr = entry->saddr; + else + addr = entry->daddr; + + if (bitstring_match(addr, cond->addr, cond->prefix_len)) + break; + if (entry->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_sock(struct sk_buff *skb, struct sock *sk, + struct netlink_callback *cb) +{ + struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); + + if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { + struct tcpdiag_entry entry; + struct rtattr *bc = (struct rtattr *)(r + 1); + struct inet_sock *inet = inet_sk(sk); + + entry.family = sk->sk_family; +#ifdef CONFIG_IP_TCPDIAG_IPV6 + if (entry.family == AF_INET6) { + struct ipv6_pinfo *np = inet6_sk(sk); + + entry.saddr = np->rcv_saddr.s6_addr32; + entry.daddr = np->daddr.s6_addr32; + } else +#endif + { + entry.saddr = &inet->rcv_saddr; + entry.daddr = &inet->daddr; + } + entry.sport = inet->num; + entry.dport = ntohs(inet->dport); + entry.userlocks = sk->sk_userlocks; + + if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry)) + return 0; + } + + return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid, + cb->nlh->nlmsg_seq, NLM_F_MULTI); +} + +static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk, + struct open_request *req, + u32 pid, u32 seq) +{ + struct inet_sock *inet = inet_sk(sk); + unsigned char *b = skb->tail; + struct tcpdiagmsg *r; + struct nlmsghdr *nlh; + long tmo; + + nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r)); + nlh->nlmsg_flags = NLM_F_MULTI; + r = NLMSG_DATA(nlh); + + r->tcpdiag_family = sk->sk_family; + r->tcpdiag_state = TCP_SYN_RECV; + r->tcpdiag_timer = 1; + r->tcpdiag_retrans = req->retrans; + + r->id.tcpdiag_if = sk->sk_bound_dev_if; + r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req; + r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1); + + tmo = req->expires - jiffies; + if (tmo < 0) + tmo = 0; + + r->id.tcpdiag_sport = inet->sport; + r->id.tcpdiag_dport = req->rmt_port; + r->id.tcpdiag_src[0] = req->af.v4_req.loc_addr; + r->id.tcpdiag_dst[0] = req->af.v4_req.rmt_addr; + r->tcpdiag_expires = jiffies_to_msecs(tmo), + r->tcpdiag_rqueue = 0; + r->tcpdiag_wqueue = 0; + r->tcpdiag_uid = sock_i_uid(sk); + r->tcpdiag_inode = 0; +#ifdef CONFIG_IP_TCPDIAG_IPV6 + if (r->tcpdiag_family == AF_INET6) { + ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src, + &req->af.v6_req.loc_addr); + ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst, + &req->af.v6_req.rmt_addr); + } +#endif + nlh->nlmsg_len = skb->tail - b; + + return skb->len; + +nlmsg_failure: + skb_trim(skb, b - skb->data); + return -1; +} + +static int tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk, + struct netlink_callback *cb) +{ + struct tcpdiag_entry entry; + struct tcpdiagreq *r = NLMSG_DATA(cb->nlh); + struct tcp_sock *tp = tcp_sk(sk); + struct tcp_listen_opt *lopt; + struct rtattr *bc = NULL; + struct inet_sock *inet = inet_sk(sk); + int j, s_j; + int reqnum, s_reqnum; + int err = 0; + + s_j = cb->args[3]; + s_reqnum = cb->args[4]; + + if (s_j > 0) + s_j--; + + entry.family = sk->sk_family; + + read_lock_bh(&tp->syn_wait_lock); + + lopt = tp->listen_opt; + if (!lopt || !lopt->qlen) + goto out; + + if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) { + bc = (struct rtattr *)(r + 1); + entry.sport = inet->num; + entry.userlocks = sk->sk_userlocks; + } + + for (j = s_j; j < TCP_SYNQ_HSIZE; j++) { + struct open_request *req, *head = lopt->syn_table[j]; + + reqnum = 0; + for (req = head; req; reqnum++, req = req->dl_next) { + if (reqnum < s_reqnum) + continue; + if (r->id.tcpdiag_dport != req->rmt_port && + r->id.tcpdiag_dport) + continue; + + if (bc) { + entry.saddr = +#ifdef CONFIG_IP_TCPDIAG_IPV6 + (entry.family == AF_INET6) ? + req->af.v6_req.loc_addr.s6_addr32 : +#endif + &req->af.v4_req.loc_addr; + entry.daddr = +#ifdef CONFIG_IP_TCPDIAG_IPV6 + (entry.family == AF_INET6) ? + req->af.v6_req.rmt_addr.s6_addr32 : +#endif + &req->af.v4_req.rmt_addr; + entry.dport = ntohs(req->rmt_port); + + if (!tcpdiag_bc_run(RTA_DATA(bc), + RTA_PAYLOAD(bc), &entry)) + continue; + } + + err = tcpdiag_fill_req(skb, sk, req, + NETLINK_CB(cb->skb).pid, + cb->nlh->nlmsg_seq); + if (err < 0) { + cb->args[3] = j + 1; + cb->args[4] = reqnum; + goto out; + } + } + + s_reqnum = 0; + } + +out: + read_unlock_bh(&tp->syn_wait_lock); + + return err; +} + +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); + + 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; + + num = 0; + sk_for_each(sk, node, &tcp_listening_hash[i]) { + struct inet_sock *inet = inet_sk(sk); + + if (num < s_num) { + num++; + continue; + } + + if (r->id.tcpdiag_sport != inet->sport && + r->id.tcpdiag_sport) + goto next_listen; + + if (!(r->tcpdiag_states&TCPF_LISTEN) || + r->id.tcpdiag_dport || + cb->args[3] > 0) + goto syn_recv; + + if (tcpdiag_dump_sock(skb, sk, cb) < 0) { + tcp_listen_unlock(); + goto done; + } + +syn_recv: + if (!(r->tcpdiag_states&TCPF_SYN_RECV)) + goto next_listen; + + if (tcpdiag_dump_reqs(skb, sk, cb) < 0) { + tcp_listen_unlock(); + goto done; + } + +next_listen: + cb->args[3] = 0; + cb->args[4] = 0; + ++num; + } + + s_num = 0; + cb->args[3] = 0; + cb->args[4] = 0; + } + 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_sock *inet = inet_sk(sk); + + if (num < s_num) + goto next_normal; + if (!(r->tcpdiag_states & (1 << sk->sk_state))) + goto next_normal; + if (r->id.tcpdiag_sport != inet->sport && + r->id.tcpdiag_sport) + goto next_normal; + if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport) + goto next_normal; + if (tcpdiag_dump_sock(skb, sk, cb) < 0) { + read_unlock_bh(&head->lock); + goto done; + } +next_normal: + ++num; + } + + if (r->tcpdiag_states&TCPF_TIME_WAIT) { + sk_for_each(sk, node, + &tcp_ehash[i + tcp_ehash_size].chain) { + struct inet_sock *inet = inet_sk(sk); + + if (num < s_num) + goto next_dying; + if (r->id.tcpdiag_sport != inet->sport && + r->id.tcpdiag_sport) + goto next_dying; + if (r->id.tcpdiag_dport != inet->dport && + r->id.tcpdiag_dport) + goto next_dying; + if (tcpdiag_dump_sock(skb, sk, cb) < 0) { + read_unlock_bh(&head->lock); + goto done; + } +next_dying: + ++num; + } + } + read_unlock_bh(&head->lock); + } + +done: + cb->args[1] = i; + cb->args[2] = num; + return skb->len; +} + +static int tcpdiag_dump_done(struct netlink_callback *cb) +{ + return 0; +} + + +static __inline__ int +tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) +{ + if (!(nlh->nlmsg_flags&NLM_F_REQUEST)) + return 0; + + if (nlh->nlmsg_type != TCPDIAG_GETSOCK) + goto err_inval; + + 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; +} + + +static inline void tcpdiag_rcv_skb(struct sk_buff *skb) +{ + 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); + } +} + +static void tcpdiag_rcv(struct sock *sk, int len) +{ + struct sk_buff *skb; + + while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { + tcpdiag_rcv_skb(skb); + kfree_skb(skb); + } +} + +static int __init tcpdiag_init(void) +{ + tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv); + if (tcpnl == NULL) + return -ENOMEM; + return 0; +} + +static void __exit tcpdiag_exit(void) +{ + sock_release(tcpnl->sk_socket); +} + +module_init(tcpdiag_init); +module_exit(tcpdiag_exit); +MODULE_LICENSE("GPL"); |