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Release 4.14 net/sctp/bind_addr.c

Directory: net/sctp
/* SCTP kernel implementation
 * (C) Copyright IBM Corp. 2001, 2003
 * Copyright (c) Cisco 1999,2000
 * Copyright (c) Motorola 1999,2000,2001
 * Copyright (c) La Monte H.P. Yarroll 2001
 * This file is part of the SCTP kernel implementation.
 * A collection class to handle the storage of transport addresses.
 * This SCTP implementation 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, or (at your option)
 * any later version.
 * This SCTP implementation is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * See the GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, see
 * <>.
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <>
 * Written or modified by:
 *    La Monte H.P. Yarroll <>
 *    Karl Knutson          <>
 *    Jon Grimm             <>
 *    Daisy Chang           <>

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/if_inet6.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>

/* Forward declarations for internal helpers. */
static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest,
			      union sctp_addr *addr, enum sctp_scope scope,
			      gfp_t gfp, int flags);
static void sctp_bind_addr_clean(struct sctp_bind_addr *);

/* First Level Abstractions. */

/* Copy 'src' to 'dest' taking 'scope' into account.  Omit addresses
 * in 'src' which have a broader scope than 'scope'.

int sctp_bind_addr_copy(struct net *net, struct sctp_bind_addr *dest, const struct sctp_bind_addr *src, enum sctp_scope scope, gfp_t gfp, int flags) { struct sctp_sockaddr_entry *addr; int error = 0; /* All addresses share the same port. */ dest->port = src->port; /* Extract the addresses which are relevant for this scope. */ list_for_each_entry(addr, &src->address_list, list) { error = sctp_copy_one_addr(net, dest, &addr->a, scope, gfp, flags); if (error < 0) goto out; } /* If there are no addresses matching the scope and * this is global scope, try to get a link scope address, with * the assumption that we must be sitting behind a NAT. */ if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) { list_for_each_entry(addr, &src->address_list, list) { error = sctp_copy_one_addr(net, dest, &addr->a, SCTP_SCOPE_LINK, gfp, flags); if (error < 0) goto out; } } out: if (error) sctp_bind_addr_clean(dest); return error; }


Jon Grimm13482.72%545.45%
Eric W. Biedermann95.56%19.09%
Robert P. J. Day84.94%19.09%
David S. Miller63.70%19.09%
Al Viro31.85%218.18%
Xin Long21.23%19.09%

/* Exactly duplicate the address lists. This is necessary when doing * peer-offs and accepts. We don't want to put all the current system * addresses into the endpoint. That's useless. But we do want duplicat * the list of bound addresses that the older endpoint used. */
int sctp_bind_addr_dup(struct sctp_bind_addr *dest, const struct sctp_bind_addr *src, gfp_t gfp) { struct sctp_sockaddr_entry *addr; int error = 0; /* All addresses share the same port. */ dest->port = src->port; list_for_each_entry(addr, &src->address_list, list) { error = sctp_add_bind_addr(dest, &addr->a, sizeof(addr->a), 1, gfp); if (error < 0) break; } return error; }


Vladislav Yasevich7086.42%133.33%
Marcelo Ricardo Leitner78.64%133.33%
Robert P. J. Day44.94%133.33%

/* Initialize the SCTP_bind_addr structure for either an endpoint or * an association. */
void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port) { INIT_LIST_HEAD(&bp->address_list); bp->port = port; }


Jon Grimm2592.59%266.67%
David S. Miller27.41%133.33%

/* Dispose of the address list. */
static void sctp_bind_addr_clean(struct sctp_bind_addr *bp) { struct sctp_sockaddr_entry *addr, *temp; /* Empty the bind address list. */ list_for_each_entry_safe(addr, temp, &bp->address_list, list) { list_del_rcu(&addr->list); kfree_rcu(addr, rcu); SCTP_DBG_OBJCNT_DEC(addr); } }


Jon Grimm4178.85%360.00%
Jacek Luczak917.31%120.00%
David S. Miller23.85%120.00%

/* Dispose of an SCTP_bind_addr structure */
void sctp_bind_addr_free(struct sctp_bind_addr *bp) { /* Empty the bind address list. */ sctp_bind_addr_clean(bp); }


Jon Grimm1593.75%266.67%
David S. Miller16.25%133.33%

/* Add an address to the bind address list in the SCTP_bind_addr structure. */
int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new, int new_size, __u8 addr_state, gfp_t gfp) { struct sctp_sockaddr_entry *addr; /* Add the address to the bind address list. */ addr = kzalloc(sizeof(*addr), gfp); if (!addr) return -ENOMEM; memcpy(&addr->a, new, min_t(size_t, sizeof(*new), new_size)); /* Fix up the port if it has not yet been set. * Both v4 and v6 have the port at the same offset. */ if (!addr->a.v4.sin_port) addr->a.v4.sin_port = htons(bp->port); addr->state = addr_state; addr->valid = 1; INIT_LIST_HEAD(&addr->list); /* We always hold a socket lock when calling this function, * and that acts as a writer synchronizing lock. */ list_add_tail_rcu(&addr->list, &bp->address_list); SCTP_DBG_OBJCNT_INC(addr); return 0; }


Jon Grimm10069.44%640.00%
Vladislav Yasevich117.64%320.00%
Marcelo Ricardo Leitner106.94%16.67%
Al Viro74.86%213.33%
Daniel Borkmann64.17%16.67%
Sridhar Samudrala64.17%16.67%
David S. Miller42.78%16.67%

/* Delete an address from the bind address list in the SCTP_bind_addr * structure. */
int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr) { struct sctp_sockaddr_entry *addr, *temp; int found = 0; /* We hold the socket lock when calling this function, * and that acts as a writer synchronizing lock. */ list_for_each_entry_safe(addr, temp, &bp->address_list, list) { if (sctp_cmp_addr_exact(&addr->a, del_addr)) { /* Found the exact match. */ found = 1; addr->valid = 0; list_del_rcu(&addr->list); break; } } if (found) { kfree_rcu(addr, rcu); SCTP_DBG_OBJCNT_DEC(addr); return 0; } return -EINVAL; }


Jon Grimm4747.00%436.36%
Vladislav Yasevich3838.00%218.18%
Chidambar 'ilLogict' Zinnoury1010.00%19.09%
Al Viro22.00%218.18%
Lai Jiangshan22.00%19.09%
David S. Miller11.00%19.09%

/* Create a network byte-order representation of all the addresses * formated as SCTP parameters. * * The second argument is the return value for the length. */
union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp, int *addrs_len, gfp_t gfp) { union sctp_params addrparms; union sctp_params retval; int addrparms_len; union sctp_addr_param rawaddr; int len; struct sctp_sockaddr_entry *addr; struct list_head *pos; struct sctp_af *af; addrparms_len = 0; len = 0; /* Allocate enough memory at once. */ list_for_each(pos, &bp->address_list) { len += sizeof(union sctp_addr_param); } /* Don't even bother embedding an address if there * is only one. */ if (len == sizeof(union sctp_addr_param)) { retval.v = NULL; goto end_raw; } retval.v = kmalloc(len, gfp); if (!retval.v) goto end_raw; addrparms = retval; list_for_each_entry(addr, &bp->address_list, list) { af = sctp_get_af_specific(addr->a.v4.sin_family); len = af->to_addr_param(&addr->a, &rawaddr); memcpy(addrparms.v, &rawaddr, len); addrparms.v += len; addrparms_len += len; } end_raw: *addrs_len = addrparms_len; return retval; }


Jon Grimm16484.54%750.00%
Sridhar Samudrala2010.31%214.29%
Robert P. J. Day42.06%17.14%
Al Viro31.55%214.29%
Rusty Russell21.03%17.14%
David S. Miller10.52%17.14%

/* * Create an address list out of the raw address list format (IPv4 and IPv6 * address parameters). */
int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list, int addrs_len, __u16 port, gfp_t gfp) { union sctp_addr_param *rawaddr; struct sctp_paramhdr *param; union sctp_addr addr; int retval = 0; int len; struct sctp_af *af; /* Convert the raw address to standard address format */ while (addrs_len) { param = (struct sctp_paramhdr *)raw_addr_list; rawaddr = (union sctp_addr_param *)raw_addr_list; af = sctp_get_af_specific(param_type2af(param->type)); if (unlikely(!af)) { retval = -EINVAL; sctp_bind_addr_clean(bp); break; } af->from_addr_param(&addr, rawaddr, htons(port), 0); if (sctp_bind_addr_state(bp, &addr) != -1) goto next; retval = sctp_add_bind_addr(bp, &addr, sizeof(addr), SCTP_ADDR_SRC, gfp); if (retval) { /* Can't finish building the list, clean up. */ sctp_bind_addr_clean(bp); break; } next: len = ntohs(param->length); addrs_len -= len; raw_addr_list += len; } return retval; }


Jon Grimm12363.08%640.00%
Sridhar Samudrala3718.97%213.33%
Xin Long189.23%16.67%
Al Viro84.10%320.00%
Marcelo Ricardo Leitner52.56%16.67%
David S. Miller31.54%16.67%
Vladislav Yasevich10.51%16.67%

/******************************************************************** * 2nd Level Abstractions ********************************************************************/ /* Does this contain a specified address? Allow wildcarding. */
int sctp_bind_addr_match(struct sctp_bind_addr *bp, const union sctp_addr *addr, struct sctp_sock *opt) { struct sctp_sockaddr_entry *laddr; int match = 0; rcu_read_lock(); list_for_each_entry_rcu(laddr, &bp->address_list, list) { if (!laddr->valid) continue; if (opt->pf->cmp_addr(&laddr->a, addr, opt)) { match = 1; break; } } rcu_read_unlock(); return match; }


Jon Grimm5060.24%550.00%
Vladislav Yasevich2833.73%110.00%
David S. Miller22.41%110.00%
Al Viro22.41%220.00%
Arnaldo Carvalho de Melo11.20%110.00%

/* Does the address 'addr' conflict with any addresses in * the bp. */
int sctp_bind_addr_conflict(struct sctp_bind_addr *bp, const union sctp_addr *addr, struct sctp_sock *bp_sp, struct sctp_sock *addr_sp) { struct sctp_sockaddr_entry *laddr; int conflict = 0; struct sctp_sock *sp; /* Pick the IPv6 socket as the basis of comparison * since it's usually a superset of the IPv4. * If there is no IPv6 socket, then default to bind_addr. */ if (sctp_opt2sk(bp_sp)->sk_family == AF_INET6) sp = bp_sp; else if (sctp_opt2sk(addr_sp)->sk_family == AF_INET6) sp = addr_sp; else sp = bp_sp; rcu_read_lock(); list_for_each_entry_rcu(laddr, &bp->address_list, list) { if (!laddr->valid) continue; conflict = sp->pf->cmp_addr(&laddr->a, addr, sp); if (conflict) break; } rcu_read_unlock(); return conflict; }


Vladislav Yasevich128100.00%1100.00%

/* Get the state of the entry in the bind_addr_list */
int sctp_bind_addr_state(const struct sctp_bind_addr *bp, const union sctp_addr *addr) { struct sctp_sockaddr_entry *laddr; struct sctp_af *af; int state = -1; af = sctp_get_af_specific(addr->sa.sa_family); if (unlikely(!af)) return state; rcu_read_lock(); list_for_each_entry_rcu(laddr, &bp->address_list, list) { if (!laddr->valid) continue; if (af->cmp_addr(&laddr->a, addr)) { state = laddr->state; break; } } rcu_read_unlock(); return state; }


Vladislav Yasevich105100.00%1100.00%

/* Find the first address in the bind address list that is not present in * the addrs packed array. */
union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp, const union sctp_addr *addrs, int addrcnt, struct sctp_sock *opt) { struct sctp_sockaddr_entry *laddr; union sctp_addr *addr; void *addr_buf; struct sctp_af *af; int i; /* This is only called sctp_send_asconf_del_ip() and we hold * the socket lock in that code patch, so that address list * can't change. */ list_for_each_entry(laddr, &bp->address_list, list) { addr_buf = (union sctp_addr *)addrs; for (i = 0; i < addrcnt; i++) { addr = addr_buf; af = sctp_get_af_specific(addr->v4.sin_family); if (!af) break; if (opt->pf->cmp_addr(&laddr->a, addr, opt)) break; addr_buf += af->sockaddr_len; } if (i == addrcnt) return &laddr->a; } return NULL; }


Sridhar Samudrala13493.06%120.00%
Vladislav Yasevich64.17%120.00%
Al Viro32.08%240.00%
Arnaldo Carvalho de Melo10.69%120.00%

/* Copy out addresses from the global local address list. */
static int sctp_copy_one_addr(struct net *net, struct sctp_bind_addr *dest, union sctp_addr *addr, enum sctp_scope scope, gfp_t gfp, int flags) { int error = 0; if (sctp_is_any(NULL, addr)) { error = sctp_copy_local_addr_list(net, dest, scope, gfp, flags); } else if (sctp_in_scope(net, addr, scope)) { /* Now that the address is in scope, check to see if * the address type is supported by local sock as * well as the remote peer. */ if ((((AF_INET == addr->sa.sa_family) && (flags & SCTP_ADDR4_PEERSUPP))) || (((AF_INET6 == addr->sa.sa_family) && (flags & SCTP_ADDR6_ALLOWED) && (flags & SCTP_ADDR6_PEERSUPP)))) error = sctp_add_bind_addr(dest, addr, sizeof(*addr), SCTP_ADDR_SRC, gfp); } return error; }


Jon Grimm12484.35%430.77%
Eric W. Biedermann96.12%215.38%
Marcelo Ricardo Leitner64.08%17.69%
Vladislav Yasevich32.04%215.38%
Al Viro21.36%215.38%
Xin Long21.36%17.69%
Sridhar Samudrala10.68%17.69%

/* Is this a wildcard address? */
int sctp_is_any(struct sock *sk, const union sctp_addr *addr) { unsigned short fam = 0; struct sctp_af *af; /* Try to get the right address family */ if (addr->sa.sa_family != AF_UNSPEC) fam = addr->sa.sa_family; else if (sk) fam = sk->sk_family; af = sctp_get_af_specific(fam); if (!af) return 0; return af->is_any(addr); }


Vladislav Yasevich4353.75%116.67%
Jon Grimm3645.00%466.67%
David S. Miller11.25%116.67%

/* Is 'addr' valid for 'scope'? */
int sctp_in_scope(struct net *net, const union sctp_addr *addr, enum sctp_scope scope) { enum sctp_scope addr_scope = sctp_scope(addr); /* The unusable SCTP addresses will not be considered with * any defined scopes. */ if (SCTP_SCOPE_UNUSABLE == addr_scope) return 0; /* * For INIT and INIT-ACK address list, let L be the level of * of requested destination address, sender and receiver * SHOULD include all of its addresses with level greater * than or equal to L. * * Address scoping can be selectively controlled via sysctl * option */ switch (net->sctp.scope_policy) { case SCTP_SCOPE_POLICY_DISABLE: return 1; case SCTP_SCOPE_POLICY_ENABLE: if (addr_scope <= scope) return 1; break; case SCTP_SCOPE_POLICY_PRIVATE: if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope) return 1; break; case SCTP_SCOPE_POLICY_LINK: if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope) return 1; break; default: break; } return 0; }


Bhaskar Dutta5248.15%112.50%
Jon Grimm4137.96%337.50%
Eric W. Biedermann109.26%225.00%
Xin Long43.70%112.50%
David S. Miller10.93%112.50%

int sctp_is_ep_boundall(struct sock *sk) { struct sctp_bind_addr *bp; struct sctp_sockaddr_entry *addr; bp = &sctp_sk(sk)->ep->base.bind_addr; if (sctp_list_single_entry(&bp->address_list)) { addr = list_entry(bp->, struct sctp_sockaddr_entry, list); if (sctp_is_any(sk, &addr->a)) return 1; } return 0; }


Michio Honda80100.00%1100.00%

/******************************************************************** * 3rd Level Abstractions ********************************************************************/ /* What is the scope of 'addr'? */
enum sctp_scope sctp_scope(const union sctp_addr *addr) { struct sctp_af *af; af = sctp_get_af_specific(addr->sa.sa_family); if (!af) return SCTP_SCOPE_UNUSABLE; return af->scope((union sctp_addr *)addr); }


Jon Grimm4795.92%480.00%
Xin Long24.08%120.00%

Overall Contributors

Jon Grimm101151.06%1222.64%
Vladislav Yasevich43622.02%815.09%
Sridhar Samudrala19910.05%47.55%
Michio Honda804.04%11.89%
Bhaskar Dutta522.63%11.89%
Xin Long331.67%23.77%
Eric W. Biedermann321.62%35.66%
Al Viro311.57%916.98%
Marcelo Ricardo Leitner281.41%11.89%
David S. Miller271.36%35.66%
Robert P. J. Day160.81%11.89%
Chidambar 'ilLogict' Zinnoury100.51%11.89%
Jacek Luczak90.45%11.89%
Daniel Borkmann60.30%11.89%
Tejun Heo30.15%11.89%
Arnaldo Carvalho de Melo20.10%11.89%
Lai Jiangshan20.10%11.89%
Rusty Russell20.10%11.89%
Jeff Kirsher10.05%11.89%
Directory: net/sctp
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